I'm guessing for the moment it's meant to stay as an exclusive for 3DS but I guess if the sales are good enough they'll port it over to the likes of the Wii or even the PS3/Xbox 360. It all depends on its success and whether Capcom wants to let console players have this game.
but if they port it, people will say "why would I buy this game for the handheld when I can play it on my Giant flat screen TV at home." not good for supporting the 3DS. --- currently playing all game cube resident evil games :D