Spreint will start releasing a new OTA update tomorrow. While unrevoked forever and 3.21 say you should keep root it may be a good idea to wait until others try. We will see here and in XDA people who are rooted take this update and let all know if you keep root or not. Remember that when ota 2.2 came out people lost root and those who did not root or took ota 2.2 and lost root had to wait about a month for a root exploit to be found. I love root, and roms based on this update will be available in a few days, so I suggest be patient and see how things turn out!