WARNING, WARNING - DANGER WILL ROBINSON
1. We tried updating from 2.1 to this -it bricked, so don't do that! (upgrade to 3.1 original beta first ( http://ul.to/zagbgu9w or http://www.fileserve.com/file/GtNsbVf), then this)
2. It seems nearly complete - so bet on a real 3.1 user release in the coming weeks from Logitech.
3. Although root is accessible through adb and su. Kernel modules, Kernel, Bootloader = all still signed. Memory is protected, so it's sadly not much of an improvement.
4. The Recovery Menu DOES NOT work, so if you update to this, prepare to be stuck on it (at least, for now). Also if it bricks you are SOL, this is an unofficial leak and voids your warranty
5. It has Netflix!
P.S. Here is your message, on the forums

Edit: MAKE SURE NOT TO UNPLUG THE BOX BETWEEN UPGRADES! Holding the recovery button will automatically reboot the box, also a Ctrl+Alt+Del from the keyboard will work as well. UNPLUGGING MAY RESULT IN A BRICK!
Instructions on how to fix the triangle with exclamtion point brick that occurs from going from 2.1->Userdebug without having gone to b55579 can be found at:
http://forum.gtvhacker.com/post3148.html
http://www.megaupload.com/?d=41D7LMGO (Mirror: http://ul.to/fw62d0ry)
(DO NOT USE WITHOUT READING ABOVE NOTES!)