Some
interesting tidbits about the Ultimate version were revealed recently. Apparently, the new characters were originally planned to be released as DLC. The tsunami earlier this year, and health issues in the staff, caused the plans to change to a standalone release.
This explains why the main title only received one set of DLC characters. Capcom planned more, but they didn't think it appropriate to release them following the disaster. That article also mentions that Ultimate MvC 3 is planned to have some downloadable content. Do you think that will actually be released in that form, or will we get yet another standalone version?