I probably will buy 3DS, but not for now, I will wait till the prices decrease. 3Ds will cost around $450 or $500 here
There are good games to be released, 3DS have great chances to be so well succeded as DS.
Considering 3Ds power, it probably can run some Wii games with appropriate adaptations, I hope that Nintendo release some Wii games for 3Ds like The last Story, Metroid Prime 3 and Super Mario Galaxy.
Other 3DS atractive is the retrocompatibility with DS. I didn't play some Dragon Quest games, now I can see a chance to play it. Of course, I'm waiting for new RPGs with incredible graphics, I want to see 3Ds running games at maximum potential.