According to the PaulGaleNetwork, a Capcom representative confirmed the publisher is hard at work developing a new Mega Man game, in addition to Mega Man Legends 3 and Mega Man Universe. The game, said to be revealed at this year's Electronic Entertainment Expo (E3), will celebrate the franchise's impending 25th anniversary (December 17, 2012). Concurrently, the rep also said the show will play host to the unveiling of a new Street Fighter and a "big splash" from Devil May Cry, likely the return of DmC.
While it's entirely possible Capcom has something up their sleeves for Mega's big 25th, I highly doubt we're going to see (or hear) from it at this year's E3. Capcom's got there hands full with Universe and Legends 3 as is, so anything else at new at point seems almost trivial.
We'll watch where this one goes, but I wouldn't get you're hopes set too high. Pre-E3 always ushers in waves upon waves of rumors; some true, others not.
Sources: Event Hubs, Cosmic Book News, N4G