While Keiji Inafune wasn't too forthcoming about a release date for Mega Man Universe at last night's panel, the actual Mega Man Universe kiosk on display at Comic-Con says the game is dropping some time in "Winter." Capcom's jgonzo confirmed the release window during a video tour of Capcom's booth, which you can view below. Jump to the 5:00 point for the reveal.
No indication if this refers to a Winter 2010 release, or early 2011. I'm currently seeking out an official comment, so hang tight.