Monster Hunter for the 3DS confirmed to be in development after it was leaked of being rumored to be shown during this year's canceled Monster Hunter Festa. Capcom wanted to show off the game as the big announcement for the event but the recent earthquake forced them to cancel the event.
Since the next big convention is still months away and Nintendo's own conference planned with Capcom was also canceled, Capcom reports their big 3DS announcement will occur during April.
It is assumed this will be the official unveiling of Monster Hunter for 3DS due to everything else Capcom has planned was already announced before the event.
http://www.gonintendo.com/viewstory.php?id=154173
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Namco could possibly be working on a set of new Katamari games based on recent searches of patent/copyright filings. The request by Namco was done on March 25 with Namco trying to lock rights to “Katamari Amore” and “Katamari Amore Rolling Whopper."
Time Crisis itself might be getting another game due to Namco filing a copyright request hinting at a new Time Crisis being developed as well.