I wish to point out that you don't need to reflash your USB key with this release.
If you are on a previous firmware, you may update by using the icon on your desktop. (Try the update twice to be sure!)
I did exactly that, (try twice that is) first time, xbmc and alot of other updates came through, second time was when mythtv was removed. Only minor gripe, the myth tv icon on the panel wasnt removed/replaced with xbmc