Bluetooth Serial Port Profile (SPP) support in OS X Yosemite
I was able to pair a bluetooth serial port via the preferences panel:

Apple Menu &gt; System Preferences... &gt; Bluetooth


My adapter was discoverable, failed auto-pairing, but I was able to pair with the pin code provided in the online documentation. The system automatically created a serial port:

alf@my-mac:~ ls -l /dev/tty.*
crw-rw-rw-  1 root  wheel   18,   6 Aug 12 15:09 /dev/tty.HC-06-DevB


Screen will open this port, but I don't have the correct baud rate just yet:

screen /dev/tty.HC-06-DevB