According to this V-Jump shot the Eventcards are…
Duelist Trial: (11/6 – 11/8)
4: Arms Hole
5: Arcana Force EX – The Light Ruler
Gunslinger: (11/13 – 11/15)
5 Win Streak: Destiny Draw
6 Win Streak: Destiny Hero – Malicious
7 Win Streak: Destiny Hero – Plasma
Evolution Match: (11/20 – 11/22)
10 Stars: Exploder Dragon
20 Stars: Card Trooper
30 Stars: Van’Dalgyon the Dark Dragon Lord
These events are holding only once. After this, the “great Update” begins. (I hope!)

From: http://www.yugioh-online.net/top/english-oc/event/ultimate/index.html
The event is open to players over Level 2 who have played a total 35 Duels or more, and it is held in Duel Academy World Server.
These are the Prize Cards from this Event:

Fossil Tusker (New Card) When this card destroys an opponent’s monster by battle and sends it to the Graveyard, inflict 400 damage to your opponent.
Phantom Dragonray Bronto (New Card) This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
* The original ATK of this card becomes 2300. If this card attacks, it is changed to Defense Position at the end of the Battle Phase. This card’s battle position cannot be changed until the end of your next turn, except with a card effect.
Il Blud (New Card) This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
* Once per turn, you can Special Summon 1 Zombie-Type monster from your hand or from either player’s Graveyard. When this card is removed form the field, destroy all Zombie-Type monsters Special Summoned by this effect.
Royal Firestorm Guards (New Card) When this card is Normal Summoned, select 4 Pyro-Type monsters in your Graveyard. Return those cards to the Deck, then draw 2 cards.
Defensive Tactics (New Card) Activate only if you control a “Gladiator Beast” monster. Monsters you control cannot be destroyed by battle this turn, and any battle damage you take is reduced to 0. Put this card on the bottom of your Deck.
Gladiator Beast Torax (New Card) If this card was Special Summoned by the effect of a “Gladiator Beast” monster, at the end of any Battle Phase that this card attacked or was attacked, you can return it to the Deck to draw 1 card.
Gladiator Beast Octavius (New Card) When this card is Special Summoned by the effect of a “Gladiator Beast” monster, destroy 1 face-down Spell or Trap Card. At the end of your Battle Phase, if this card attacked or was attacked, return this card to the Deck unless you discard 1 card.
Teva (16 winners, YOC Spring 2007) When this card is Tribute Summoned successfully, your opponent cannot declare an attack during his/her next turn.
Twinheaded Beast (8 winners, place YOC Spring 2007) This card can attack twice during the same Battle Phase.
Victory Dragon (4 winners, YOC Spring 2007) This card cannot be Special Summoned. To Tribute Summon this card, you must Tribute 3 Dragon-Type monsters. If this card attacks your opponent directly and reduces their Life Points to 0, you win the Match.
History of Ultimate matches:
1st Ultimate Match: 2008/08/28 – 2008/09/12 (15 days)
2nd Ultimate Match: 2009/01/19 – 2009/02/04 (16 days) 144 days later
3rd Ultimate Match: 2009/05/04 - 2009/05/15 (11 days) 105 days later
This recent flood of events may seem excessive, but Konami did a very similar thing previously:
Anniversary Trial 3rd: 2008/08/01 4th: 2009/04/16
Ultimate Match 1st: 2008/08/28 (28 days later) 3rd: 2009/05/04 (18 days later)
Season end 7th: 2008/09/11 (14 days later) 9th: 2009/05/14 (10 days later)
Pack release 48th: 2008/09/25 (14 days later)
So if this pattern continues perhaps we will see the next pack released around 2009/05/28, thats my prediction.

Anniversary Trial 50 Event will start again running from 04/16/2009 19:00 PDT to 05/02/2009 19:00 PDT. AT50 is a Special Event held every year, the event runs likes a Duelist Trial Event but it’s open for 24hrs..
It’s Special Thanks from Konami here is the message from Konami Official Site
To celebrate the 4th Anniversary!!
We will be holding the “ANNIVERSARY TRIAL 50″!!
Thanks to all your loyal support, Yu-Gi-Oh! ONLINE can celebrate its 4th anniversary!
A big Thank You to all Players who made the Game what it is today!
We would also like to state that we at Konami will do everything in our power to make Yu-Gi-Oh! ONLINE a more enjoyable gaming experience for all Users.
As a show of thanks, we proudly announce the special event “ANNIVERSARY TRIAL 50″!!
You can look forward to bigger and better things from Yu-Gi-Oh! ONLINE.
So far only 1 prize card has been announced (from the Korean page), it is new card Beast King Barbaros for the 50th win :

Usually the other prize cards are just re-release cards from Old GS/DT Cards from the previous seasons.
(A new issue of v-jump is due out next week on the 21st but it will be too late for this news, yet it might contain information on the current championship cards)
From the 51st win onwards, the same prize cards will be given to you in random order, If you lose a duel, you will draw a card from the special “Loser’s Pack”.
The “ANNIVERSARY TRIAL 50” is held in its own special lobby which can be accessed from the Duel Academy Server. (Red Door). All duels during this event will be Single Duels with opponents being matched automatically.
“ANNIVERSARY TRIAL 50” is a world wide event where users from all regions can take part! but you must be LV2 or have a Minimum 35 Total Duel to take part in it.
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* Unlike normal lobbies, your opponent’s name will not be shown when you are paired,
* If a duel overruns, but finishes within an hour after the event’s closure, the duel will stand. A card will be issued and a DUELPASS point is spent on completion.
* If a duel fails to finish after the 1 hour buffer time, it will be a non-result. No card is awarded and no DUELPASS points spent.
* The cards awarded during this event are virtual cards for use in Yu-Gi-Oh! ONLINE DUEL EVOLUTION only.
* A Duel in “ANNIVERSARY TRIAL 50″ will cost 1 DUELPASS point like any duel. You can not take part unless you have enough DUELPASS points.
* If you are disconnected before picking up your card, you will receive it when you log in.
History of anniversary trials:
1st Anniversary Trial: 2006/04/24 – 2006/05/01 (1 Week)
2nd Anniversay Trial 2007/10/26 – 2007/11/09 (2 Weeks) 550 days later (1.5 years)
3rd Anniversary Trial 2008/08/01 - 2008/08/18 (17 days) 280 days later (0.75 years)
4th Anniversary Trial 2009/04/16 – 2009/05/02 (16 days) 257 days later (0.7 years)
6-8 New Gunslinger Begin cards in this event are Blizzard Dragon, Belial – Marquis of Darkness and Fossil Dyna Pachycephalo

13-15 New Evolution Match begin cards in this event are Mad Reloader,Fog King and Thunder King Rai-Oh

20-22 Duelist Trial 23 Spledid Venus start again for 2nd time

27-29 Gunslinger 23 (Fossil Dyna Pachycephalo) start again for 2nd time

We know the next events cards from V-Jump 4/2009
6-8 Duelist Trial Exodius begin for second time

13-15 Gunslinger Armityle start again for second time

20-22 Evolution Match start again for second time

27-1 New Duelist Trial begin cards in this eventare Des Mosquito and Splendid Venus

This is the Most Boring month for me because there is no Konami Patch and No News and New Booster Pack No New MP Card.