Second Duelist Trial Prize cards already announce on official site.
Here Prize Cards you can get

Date and Time
2010/07/16 20:00 JST – 2010/07/17 00:00 JST
2010/07/17 04:00 JST – 2010/07/17 08:00 JST
2010/07/17 12:00 JST – 2010/07/17 16:00 JST
2010/07/17 20:00 JST – 2010/07/18 00:00 JST
2010/07/18 04:00 JST – 2010/07/18 08:00 JST
2010/07/18 12:00 JST – 2010/07/18 16:00 JST
2010/07/19 06:00 JST – 2010/07/19 10:00 JST
2010/07/20 00:00 JST – 2010/07/20 04:00 JST
2010/07/20 18:00 JST – 2010/07/20 22:00 JST
2010/07/21 12:00 JST – 2010/07/21 16:00 JST
2010/07/22 06:00 JST – 2010/07/22 10:00 JST
Expiration Date of this Special Pack is 2010/07/30.
Konami decide to rerun this event again (Third Duelist Trial).
Date and Time
2010/08/06 20:00 JST – 2010/08/07 00:00 JST
2010/08/07 04:00 JST – 2010/08/07 08:00 JST
2010/08/07 12:00 JST – 2010/08/07 16:00 JST
2010/08/07 20:00 JST – 2010/08/08 00:00 JST
2010/08/08 04:00 JST – 2010/08/08 08:00 JST
2010/08/08 12:00 JST – 2010/08/08 16:00 JST
2010/08/09 06:00 JST – 2010/08/09 10:00 JST
2010/08/10 00:00 JST – 2010/08/10 04:00 JST
2010/08/10 18:00 JST – 2010/08/10 22:00 JST
2010/08/11 12:00 JST – 2010/08/11 16:00 JST
2010/08/12 06:00 JST – 2010/08/12 10:00 JST
From : http://www.yugioh-online.net/v3/events/schedule
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