I would love to see another PSP Castlevania, especially since I had a great time with DXC. I don't have anything in particular I'd like to see made, just another CV for the PSP.
...or at least anything new for the PSP, Castlevania or not. I already have the games I want for it, but there hasn't been anything for a while that I've really felt like I had to own. I own 12 PSP games, and I can think of a single thing left that I absolutely need to buy. But then again, it's practically the same way for me with the DS, too.