No, the latest 2.1 ROM for the Eris came out of HTC Tiawan. It's a zip file that you load on SD card, basically reboot phone and the phone updates to 2.1.
My understanding is you can't go back to 1.5 and it will let you OTA when 2.1 is pushed.
See the worst case is I get stuck with an OS I wanted anyway and a phone which is a little bit smaller , slower, and has a little less memory. And for that I get to keep... what ... .$200 - $300 in my pocket? Remember I got $0 invested in this gamble!

The best is I am currently using the OS I wanted till the "Incredible" arrives... Umm... not a bad trade off in my book.

I like educated gambles...
