Apparently the new OTA comes with a new Hboot version that prevents you from going back to S-ON if you root the OTA using unrevoked 3.21. Yes, there probably will be a solution for this but if you decide to bring your phone in for repair/replacement, you might be in trouble.
Link: NEW Hboot with OTA update Dont root !!!! - xda-developers
The OP of the thread over at XDA found a workaround.
Link: http://forum.xda-developers.com/showpost.php?p=8290138&postcount=22
Link: NEW Hboot with OTA update Dont root !!!! - xda-developers
The OP of the thread over at XDA found a workaround.
Link: http://forum.xda-developers.com/showpost.php?p=8290138&postcount=22