Sorry to burst your bubble on the 2.2 speculation, but the Moment update has released and it is 2.1.
I expect that the delay to the Hero 2.1 update is because of HTC's SenseUI, and assorted problems. This isn't an excuse, mind you. Both HTC and Sprint had longer to work out this upgrade than did Verizon's similar HTC phone. There really is no excuse for this delay!
And no, there is not a single "market" with 2.2. The Nexus One will get 2.2 first, but that has not been released.
It is not Sense, otherwise the the Eris would still be waiting. Its the same hardware. Im thinking SPrint is having a harder time disabling some things than they expected.
I finally found the update and just finished downloading it along with the instructions on performing the update. If you want to know where to get it then you can email me. email@example.com.