The HTC Droid Eris update doesn’t bring you up to speed with Android 2.0 and instead only offers a teeny-tiny single update described by Verizon Wireless:
Rare instances where the display locked or appeared to be in an out-of-service state when attempting to wake up the DROID ERIS from screen saver mode no longer occurs.
Hooray. The HTC Hero update was made available only a few days ago and the Support Page on HTC’s website doesn’t outline the updates/improvements.