this thread for instructions). I've used it twice so far, to go from the .2233 leak to the .230 leak, and then to the .232 leak, and it worked flawlessly both times. In theory, when the official OTA is released, after someone posts the update file we should be able to flash it using the same method without data loss. There are no guarantees of course, but I'm enjoying ICS and Webtop 3.0 so much that for me, it's definitely worth the risk of having to FXZ back to .902 and lose data (worst case scenario). I'm also rooted and have all my apps/data backed up with Titanium Backup, so even in that scenario I should be able to restore them. Highly recommended.