Sometimes just probing around pays off, a guy from ThisAndroidLife sent an email to HTC asking about some rumors he heard about the 2.1 update. Surprisingly, an HTC representative sent an email back letting him know exactly when to expect the update.
"Some of the phones in our Android line up including your Hero are due to receive an upgrade, and it is scheduled to be released starting at the end of April. Your phone should be upgraded Over-The-Air. You can expect a pop-up message on your phone when connected to the internet once it is ready. When the upgrade is ready, we will notify you via our website and on various social media networks including Twitter and Face book"
The statement above is from HTC. There you have it, straight from the horse’s mouth. If you have the original Hero, you can expect this update by the end of the month. The rest of the Sense UI devices should be upgraded shortly after.