Finally news of the next incarnation for Yu-Gi-Oh! online from v-jump scan (credit shinji116)

Here is a translation of the above (credit: Saias)
1. The Beta Test will happen on the 18/12/2009 and the official release will be sometime in 2010 (no date confirmed yet)
2. They will add alot of new features into the game, with 3D animation from our avatars and more special effects from cards.
3. Further details about Yu-Gi-Oh Online Duel Accelerator and when the game will be officially released will be posted at http://www.yugioh-online.net on the 18/12/2009.
4. Alot of the new features will be based on the Yu-Gi-Oh World Championships 2009 game on Nintendo DS.
5. Duels from the Beta Testing will be free but there is no indication on how long that free period and beta test will last. Also everyone can take part in the Beta testing.
6. All cards from YGO2 will be transfered to the YGO3 Database, which explains the 3 hour maintainance.
7. Also from what i can gather you can open 2-3 packs at a time but i don’t know if those packs are new packs (Pack 49 and beyond).
Thats all i can gather from the Scans. Please feel free to add onto what i have translated so far. 
From talk around the net this version seems to be more like a ported version of the PSP game, which would mean Konami would be abandoning continued development from the original “Power of Chaos”, and concentrate more on parallel programming.
So this version will be heavily influenced by Tag Force.
Looks like the animation in Tag Force will be implemented and there are some 3D monster animations as well as character animations, also talks about a card point system.
Notable from the field shot above is the addition of a chat window.
Not sure how they will maintain existing avatar clothing and items, however it appears you have the option to minimise them anyway !
Also speculation that the current event system would be overhauled. Competition and individuals are more often ….
You may not know but You can filter cards in Deck Construction screen by Booster Pack and it will display only Specific Packs Cards you have.
First You need to go to Deck Construction Screen and click on the icon you see in this picture (It’s search card by text icon) then type Like this “Pack 48”

Click Yes After that you will see only Booster Pack 48 cards (only cards you have)

You can change number 48 to other number to display only pack cards you have from specific Booster Pack. This is very good to filter only pack cards you want to see how many did you have, Good for Collectors,
Eveytime you want to filter cards by booster pack you need to click on Numer of Total cards you have before clicking on the card search icon

then repeat the first step again If you don’t you may not see anything.
Note : word to filter cards by specific booster pack are different in each country, “Pack 48” is working and “パック48” (It mean Pack 48 in Japanese) also working for Japanese, I don’t know which word working for German and other country.
Credit : Command’s Knight Blog (originate from game2channel bbs)

YU-GI-Oh Online Booster Packs split into 2 period, First period is YU-GI-OH Online 1 Booster Packs. 2nd is YU-GI-Oh Online 2 (Duelevolution) Booster Packs(There are some different this is why I need to split it into 2 Period).
During YU-GI-OH Online 1 Period You can’t get Ban/Forbidden cards from Booster Pack(Konami remove all of them) and Some Cards from the booster becoming Event cards such as Dark Necrofear, Strike Ninja, Dark Ruler Hades etc…, some Booster Packs follow OCG Booster Packs but some don’t. Here a completly info about YU-GI-Oh Online Booster Packs. (more…)

“Ultimate Match” is The New Special Event in YU-GI-OH Online. It’s Match duel you will get Prize cards every 10 star you collect. It’s the same with “Evolution Match” but with 100 Stars (Once you have your first 100 stars, you can continue to win prize cards for every 10 stars won), When you won a duel you can get 3 cards from current booster pack.
Note : For 110 star or more you got the same set of prize cards again (It’s not random), You also get 30 TP for every Match Duel won.
And this is something different from other YU-GI-OH Online Event
1. “You may be paired with NPC’s!” Yes This is the only event that have NPC involve in it.
2. This is the only event that release YOC (YU-GI-OH Online Championship Cards) as a event cards. (YOC Summer 2006 are Prize cards)
This Event require LV2 or more and it will hold on Duel Academy World Server,
This is a Prize Cards in this Event

10 Star = Gemini Imps
20 Star = Tualatin
30 Star = Ancient Gear Explosion
40 Star = Ancient Gear Engineer
50 Star = Brain Crusher
60 Star = Hunter Owl
70 Star = Winged Rhynos
80 Star = Sword of Dragon’s Soul (Top 16 YOC Summer 2006 Prize card)
90 Star = Riryoku (Top 8 YOC Summer 2006 Prize card)
100 Star = Anti-Spell Fragrance (Top 4 YOC Summer 2006 Prize card)

This Event will start on 2008/08/28 15:00 ~ 2008/9/12 10:00 (JPN Time) (15 days)
From : http://www.yugioh-online.net/top/english/event/ultimate/index.html
We just finish Anniversary Trial 50, Now we will have another Special Event again I’m surprise, Look like this event will start every year also.