PS4- Jak and Daxter 4- I'm probably one of the few people who prefer these games compared to Uncharted+TLOU, but I would really like to see Naughty Dog go back to this. Doubt they will though, but maybe another developer could pull it off.
XBO- Conker sequel- Of all Rare franchises to bring back, I imagine this would be higher up on Microsoft list. I would say a Lost Oddessy sequel, but I doubt that'll never happen since mistwalker is supposedly working on The Last Story 2.
Wii U- Kid Icarus game like Uprising- I've poured more than 100 hours into Uprising, and its possibly my favorite game on the 3DS. If they make one with a even better single player with even more achievements and weapons, plus a more expansive multiplayer with more game types and bigger games (like 6 vs 6 or 10 vs 10) I'd never need another Wii U game to entertain me again. Though Sakurai said he wasn't going to do another one, maybe someone else could do it.
3DS- Golden Sun- The first 2 Golden Sun games were some of the best GBA games, and the DS one, while not as good, was still fun. Camelot hasn't been pumping out as many games as they use to, so maybe thats a sign their puting a lot of time into a GS game.
Vita- Tearaway 2- I know Tearaway hasn't been out that long, but it convinced me to buy a Vita and loved it. I'd like a new one, but MM is working one a PS4 game so I doubt it'll happen.