Ultimate Marvel vs Capcom 3 and Marvel vs Capcom 2 are being pulled from PSN and XBLA. This includes DLC, and both games (plus DLC) are currently on sale through PSN ahead of the deletion date. XBLA discounts may be coming.
Both games will disappear from digital marketplaces by 12/17 for PSN users and 12/26 for XBLA buyers. If you have previously downloaded them, these games will remain available for download for the foreseeable future.
Note this deletion does not seem to affect Marvel vs Capcom Origins, the somewhat recent combo release of Marvel Super Heroes and Marvel vs. Capcom.