Engadget received confirmation that HTC will offer an Android 2.0 update for the Hero. The fate of other devices is unclear.
"Yes, we are working on an Eclair update for the HTC Hero. Because Eclair is a significantly enhanced release, it will require some time to update Sense for this new version of the Android OS. Please be patient while we work to provide you with a tightly integrated experience like the one you are already enjoying on your Hero."