The only way they won't release a new controler IMO is if the play style of Brawl is much different. Anyone play Sony's Battle Royal?
But looking at the Nintendo's regular controller or whatever you call it it has a diamond button configuration like the 360 and PS3, with a bit different spacing (which I hate). The gamecube's button configuration were so unique. Using the Y button as a safety for your guns in MGS Twin Snakes? Genius. And something about Wind Waker too.
Devolution requires disc check to run games but currently Dios Mios doesn't. And I'd hate to see piracy nab nintendo this generation as it did the last. As I would also find it a bother to switch to my old wii to play my GC games.
And, if Nintendo plans on having GC virtual console, surely that can be exploited, ya?