I'm testing on latest experimental build and my BT KB is detected and pairs great (i type in the code and its marked as trusted and connected). But thats where it stops, the only key strokes that seem to work is a good old ctrl+alt+del which as expected reboots the PI, nothing else works :(
Bluetooth is hit and miss with Rpi unfortunately. I have had good luck with using Logitech keyboards on Rasplex. I use the Logitech K400 and have no issues.