I'd love to see Perfect Dark ported, I think it could work well on the DS. The system is great for FPSs. DK64 could still happen, Rare has been porting the DKC games for Nintendo on the GBA even though they're working for Microsoft, so why not? However, who really wants to play DK64 again? I mean, I personally liked it, but even I thought there was too much collecting in there. Maybe if they tweaked the collecting a bit and made it easier to swap characters.
But what I'd really like are NEW games! Rare is one of those developers that I believe cuold come up with some really outstanding ideas for the DS's extra features.