"I really feel like I'm satisfied with the 3DS hardware as it is. I feel like it's the best for this generation. What we're thinking about right now is probably going to be for a future generation of handheld." - Shigeru Miyamoto

Looks like we're going to be hanging onto the current 3DS for some time. Miyamoto didn't have anything to say about revisions, but did admit to pondering ideas for a future generation portable. No worries, that one will be quite some time away.