A speculated May-July 2011 before Gingerbread comes to the DHD and other reports that speculate about there being no DHD updates from HTC until Gingerbread comes - all since the 2.2.1 fail of an update released in late 12/10 that introduced more problems than it resolved.
HTC may be better than other manufacturers when it comes to releasing official updates but I'm not willing to wait for 6+ months following the official Gingerbread release date in the hope it resolves all the existing problems - there are other ways