if it eases anyones mind, just go off chat with sprint.
9:00:09 AM : Me: i guess what im asking is will the official 2.1 hero update be a clean wipe and install?
9:00:55 AM : Rep.: Let me check.
9:08:35 AM : Rep.: Please allow me a few moments. Let me check the details in this regard.
9:12:30 AM : Rep.: I would like to inform you that, yes this will be clean wipe and you can install.
so, looks like installing this leak wont effect the official one since it will just re wipe the phone again.
from android central
also from edngadget..looks to be released anyday now
http://www.engadget.com/2010/05/19/s...d-2-1-upgrade/