Pyschonauts was one of Allison's favorite games of all time, so we'll be sure to keep following any developments.
Update: Thanks to Car1gt for shattering our dreams and letting us know about Joystiq's update to the story:
Update: Sadly, it seems that the "coming soon" image was merely intended to indicate an eventual info page for the original Psychonauts. Double Fine has recognized the confusion, and quietly un-darkened the image to make it more apparent. So no Psychonauts 2 after all. Color us disappointed.