I posted this elsewhere and maybe this is the best spot to place this question...or maybe not .
Has anyone stated or confirmed if I go back to stock and get the update and not be satisfied compared to the Ultimate Droid v7.8 (in my case), will I be able to re-root and go back to v7.8 with the new OS?
If Ultimate Droid is using 2.0.1 for it's base then no, you will not be able to do anything like that until they root 2.1.