Yeah, at this point, if you haven't installed Gingerbread, it seems kind of silly to install unrooted Gingerbread & run this when you can just install Gingerbread already rooted, but hopefully the .apk works on the official OTA when it comes down (whenever that may be).
I did subscribe to the thread on XDA to follow it's progress though.
Gingerbreak 1.1 (released a few days ago) works perfectly.