I'm currently working with hasu's code to do a bluetooth mod for my Kinesis contoured keyboard. Right now, I'm just trying to get the USB portion working (I think I have the code modified correctly, I just need to wire up my matrix breakout boards). The next step is getting the bluetooth working. After that, I hope to update hasu's code to work with the official iWRAP 5 firmware and improve power consumption (code comments imply that it isn't great right now). If I can get that all sorted out (or at least the basic bluetooth part) I am considering making my own teensy-like dev board with integrated bluetooth module and perhaps integrated Li-Po charger as well.
Hasu: I might be bugging you more as I get to the bluetooth stage of my mod, especially now that I know you are on IRC