These aren't going to be popular.
1) Too Human 2 - DD might be a dickhole, but I still loved Too Human. Not gonna happen though.
2) Kane and Lynch 3 - Please can we have servers and/or drop in multiplayer.
3) Advent Rising 2 - Never gonna see this story wrap up unfortunately.
Some more popular options might be:
4) Road Rash
5) Another Kyle Katarn based Jedi Knight game
6) Flotilla 2