The one we're really waiting to see is M.O.D.O.K., who was apparently pretty hard to fit into the traditional Minimates mold. Unfortunately, he's not coming out until wave 3. Wave 1 arrives this October. Head over to Art Asylum for more images and info.
Update: As a few commenters pointed out, Bison is actually from a Street Fighter 2 line of Minimates (especially considering he's not in Marvel vs. Capcom 3.) The new line will feature an updated Chun-li figure, however.