I think a version of Dead or Alive would have huge sales on iPod and iPad. Ditto for a collection of the Raiden shooters. Shooters also sell well on both I have all current fighters and shooters on the iPod and iPad, but those two would rock. Especially DOA.
That would be really good but all these big titles turn out to be shrinked versions on IOS. So what I can expect is blade of fury 2 from gameloft.