If we got an N64 Classic, I'd hope that they would include Bomberman 64: the Second Attack. That game is surprisingly expensive (somewhere in the range of $200, from what I've seen), and unlike the original Bomberman 64, it hasn't been re-released.
Hopefully they'd be able to make a deal with Microsoft to include games like Banjo-Kazooie, Diddy Kong Racing, and Perfect Dark at the very least, though I don't know how likely that is. (all of this cooperation with Nintendo is promising, but it seems like there's a very big difference between that and putting their games on Nintendo products)