There was a Streets of Rage 4 planned for Dreamcast but it never made it passed the concept stage... http://www.youtube.com/watch?v=j4hs0omE4zg
Otherwise I'd settle for a remake of either on xbox live. If either get made in to a full retail title, I know that I will hate it...as they will have sandbox, car driving, cover system...and all other things which suck the gameplay out of todays modern games.







