The game World Championship Poker is currently not out yet, here is the little info I've found: http://au.wii.ign.com/articles/746/746481p1.html . This info dosen't mention that its online.
The other poker game on the Wii is, World Series of Poker: Tournament of Champions -- 2007 Edition. This game was given a 4 from IGN, you can check out the review here: http://au.wii.ign.com/articles/761/761372p1.html and its not online.
Hope that helps