I am absolutely convinced that one of the four digital-only games Double Fine has in the pipeline is Psychonauts-related, if not a full sequel.
I draw your attention to this recent Eurogamer interview with Tim Schafer
, in which he doesn't deny working on it. In the same interview he also doesn't deny working on digital-only games (which would be announced shortly afterwards).
But I really want to call your attention to this quote:
The main thing that's stopped me is that we can only do one thing at a time. If we can get it to the point where we're making multiple games, then we can work on the sequel while we're exploring new IPs at the same time,
This is EXACTLY what they are
doing now! I don't think you can get more of a hint without full-on announcing the damn thing!
Agree? Or just want-or-not-want?