1. Silent Hills
2. Technically a prequel I guess, but what I wouldn't give to have a Metal Gear Solid game about the Cobra Unit kicking ass in World War II
3. D4 Season 2
4. Drakengard 4, one with a competent development team and a budget of more than $30. I think this one might actually happen with Automata's success. Fingers crossed.
5. Illbleed 2
Unpopular opinion, but as much as I love Haunting Ground, I really don't see why there's so much demand for a sequel. The plot seemed pretty self-contained, and I think it would feel forced to tack a new story onto the ending. Unless you're a huge loser like I am and like to pretend that it led into Resident Evil 4.