this will only be barely related
I'd love to see a new iteration of SF3. 3S is 3S and I think asking for an HDR-style balance change is a bad move at this point in the game's life. but I'd love for a fourth installment in the SF3 series. new content would be fine, but 3S is known for having a godlike top tier and it'd be cool to play SF3 mechanics with actual reasonable balance. I think the FG community would like it a lot too.
CvS2 is (IMO) mostly fine as it is and just a re-release and not a rebalance/new game would be good enough for me. I wouldn't complain about a new CvS though.
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http://www.youtube.com/watch?v=npHDxSvwCE0