as far as i know from what i have read it IS the OTA update, it got leaked somehow, the version number listed on the zip will be identical to the version you are running on 2.2.2 but that is because motorola names their updates based on what version it is an update for, not based on what you are upgrading to. and remember you can SBF back to 2.2.2, i would *assume* that if you SBF back after they release the update to everyone you can accept it OTA. regardless, P3droid is going to release a pre-rooted version of the update that you can flash onto 2.2.2 using bootstrap recovery. It will load the update onto your phone with root already enabled. There is a thread on mydroidworld with instructions, everything is set but the links are not yet active, so you cant yet download it.