First off, don't kill the messenger. It looks like Verizon has started pushing out the long awaited Android 2.1 update ( with Sense UI ) to Droid Eris users. Not very many people are reporting getting it, but of the few that have one user over at Androidforums makes the claim, and has pictures to back it up.
Not all is Rosie (pun intended) though. There are reports of complete device wipes, as well as Google account sync issues. My advice, Eris users invest in some backup software and get everything ready in case this is the "real deal" and not a technical glitch.