Retro City Rampage is currently going through the certification process for Xbox Live Arcade and WiiWare. RCR creator Brian Provinciano mentioned on Twitter (noticed by Eurogamer) that the game will "hopefully" be out this month on WiiWare, with no date mentioned for XBLA.
The game is also close to a launch on the European PlayStation Network, where it has been available in the States since October 9, along with PC. If you have the opportunity, do check RCR out, for in our review we called it the "perfect game for gamers."