I wouldn't mind another collection. In all honesty, I think Konami did a pretty fantastic job with the one we got.
I wouldn't mind seeing Vampire Killer on a new collection, or the crappy computer ports. I dunno, it would be kind of fun to experience the weirder stuff. Vampire Killer isn't my favorite by a long shot, but I wouldn't mind giving it another go.
And more info on the Bloodlines beta would be nice. And the JP version of CVII, just for the sake of different music. But I'm sure that ship has sailed for both of those, since they weren't addressed in the previous collection.
But a remake of one of the older titles or a brand new game would be ideal. Really not expecting Konami to do anything, though.