btw, those eager to try external keyboard already can give it a try with all the BT progress made by fattire (the real hero).
Since I want to stay on the safe side myself, I compiled this 2G SD image that you can boot into and have working bluetooth (keyboard and external audio confirmed working). Of course use at your own risk and such:
go to settings -> wireless & networks
make sure that bluetooth is enabled and then you can explore and pair devices in "bluetooth settings" there.
Range so far is in the area of 13", so usable for a keyboard at least.
Have at it folks!