You'll need same version as OTA, so 2.3.15, and odexed (not deodexed).
Rooted didn't make a difference with the last update, but mine still said it was rooted, but didn't work.
I just got done dusting off/updating my original OTA (rooted) in preparation for the big update. I don't trust the sbf's... someone's always complaining about some strange problem. If I have to sbf, I immediately restore a backup after.
After the update, I'll have to manually deodex I suppose. Time to check it out I guess. Last time I used the easy 928 theme to deodex.