I would like if Kevin Straker got added to the game, even though i admit he is a bizarre choice for the roster. I had the game and even though it really has nothing to do with Street Fighter , i enjoyed it a lot , and it looks like Capcom recognized him as a character so he has a small chance of getting added.
He has a cool design, reminds me of Captain Commando
His intro cutscene could be his portal phasing , reference to the old NES game.
He could work as a zoner since his attacks in Street Fighter 2010, were all projectile based.
As for his theme song, i would love a remix of one of these themes ,also found in the original NES game.