Theres yet another complimation you may want to check out, coming for all major systems except the XBox, there is also a GBA version coming.
However, dont get your hopes up, the console versions contain Rayman 3 and Arena which probably states a complimation is too quick in my opinion, but the console versions also contain RAYMAN 2, which may or may not be the updated version seen on the Playstation 2.
The GBA version is just another two pack game, Rayman Advance and Rayman 3 Advance, however if you dont own one, or either game, its probably best to pick up this since both are top-quality games.
Heres a couple of boxes (Which seem like mock-ups to me)
http://www.rayman-fanpage.de/rayman2/news/rayman-10th-anniversary_ps2_box.jpghttp://www.rayman-fanpage.de/rayman2/news/rayman-10th-anniversary_gba_box.jpgThese games definatley are real, but theres extremely little information out on them. But major retailers like American Wal-Mart's online store lists the GBA version.
Should the GCN version indeed carry Rayman 2, its pretty much THE chance to get all of the Rayman games on one system (Although, how are they going to hold 3 games in one disc? 3 Disc set?)