What attracts me to it is that it is supposedly 5 consoles (NES, SNES, N64, GCN, REV) in 1, therefore it can play games for 5 different consoles.
I sold my GCN a few months ago and thought that I wouldn't bother with getting another console but there are lots of classics on the N64 and SNES that I'd like to replay with perfect emulation and the REV is perfect for that.
Plus, the speculation that the Rev won't have a sky high price makes it even more appealing.
Roll on Autumn 2006.