Looking at the titles that have been announced so far, the pace at which games are being released is comparable to the N64 and GC.

Miyamoto:
The hardware is basically a GC. We’ve upgraded our development tools to new versions but, you can still use GC programs as they are. With that in mind, I thought we could remake GC titles for the Wii and modify them to work with the Wii remote so that they’re more fun to play.
http://www.gamebrink.com/news/602-Mi...ew_Part_2.html