Two new anime have been announced:
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牙-KIBA-
Broadcast: April 2006
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.hack//G.U.
http://www.hack.channel.or.jp/gu/
Broadcast: 2006
It could be based on the .hack//G.U. PS2 game (I'm not sure if its released yet or not).
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There is a magazine thats called:
.hack//G.U. The World (first issue out on 26/11/2005)