Amazon has come through with release dates for UDON's Mega Man Tribute and Mega Man Gigamix Volume 2. Having not been officially announced by UDON themselves, these dates are likely tentative and are subject to change upon a moments notice.
Mega Man Tribute
Price: $26.57 (reg $39.99)
Release: July 19, 2011
Authors (and possible artists): Jeffrey Chamba Cruz, Hitoshi Ariga, Sean Galloway, Omar Dogan, Long Vo, Joe Ng, Sanford Greene
Mega Man Gigamix Volume 2
Release: August 2, 2011
If Amazon is correct, it sounds as if Hitoshi Ariga himself will be contributing to Tribute, in addition to other high-profile artists such as Sean Galloway (Spectacular Spider-Man), Long Vo (Gaia Online) and Sanford Greene (DC Comics). UDON has yet to confirm the presences of these folks, but it sure seems likely.
The UDON crew usual follows up with official announcements shortly after these Amazon "leaks" bubble up. Hopefully, we'll get the official word on release dates and other details soon!