We've already seen it go down unofficially, but we've received word from HTC today that Android's coveted "Cupcake" branch of updates and fixes -- or at least a majority of it -- will likely be making it to the G1 in the future as a legitimate over-the-air push. HTC isn't involved in deciding what updates get pushed to the G1 or when, but given the update cadence so far and the G1's support for Cupcake's capabilities, the company believes that it's just a matter of time before T-Mobile makes it happen. The timing is still a big question -- HTC's more or less out of the loop on the schedule, and it's up to Google and T-Mobile to figure out how it's going to play out. We'll keep you updated as we find out more!
Update: We pressed HTC spokespeople to give us a little more to go on, but got the standard "we can't comment on rumors or speculation" line. T-Mobile, Google, your move -- you've got plenty of folks waiting. A belated Festivus gift, perhaps?