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I've got an UNROOTED Thunderbolt and manually flashed it Sunday night with the leaked developer MR2 update. I previously was experiencing constant reboots (every 1-3 hours), inconsistent WiFi Hotspot operation, and the issue with losing 3G connectivity upon plugging in the USB cable.
After flashing with the MR2 update... it's been SUPER STABLE and has not rebooted once!! And the Wifi works great as well. This update seemed to solve all my problems and am just waiting on Verizon to turn on the 4G (they have one tower activated for testing). Very glad this got leaked because I've been very frustrated with this phone and I personally think that it shouldn't void any warranty since I was unrooted and it's their signed OTA update.
Good luck! If you manually flash, you will need to backup everything you can and basically reinstall the ROM to a factory reset state. Crossing my fingers that the real OTA doesn't brick my phone or cause any other issues.
I flashed the leaked MR2 update also and haven't had reboots or GPS problems and my battery life seems a bit better, not great but better. Now i'm truly glad I bought the Thunderbolt.
Flashed the MR2 update when it was leaked. Had one reboot, just considered it a fluke. Went almost 48 hours without a reboot, have not loaded any new apps, and then all of a sudden yesterday evening, my phone started rebooting. 5 times now in the past 12 hours. Once while I was on mobile hotspot, once just from unlocking it, another time when I went to use the internet, and then today again twice while using mobile hotspot.