Ryan Schorman of Wooden Camera discusses his Black Magic Camera PL mount adaptor and other modifications at NAB 2014.
Here are the product descriptions mentioned in this interview:
The Wooden Camera BMPC 4K Modification + PL Mount converts your Blackmagic Production Camera 4K to an interchangeable mount with included PL Mount. The interchangeable mount is compatible with RED Epic/Scarlet lens mounts which, by use of adapters, allows you to mount PL, Nikon, Canon, Leica, and BNCR glass on your camera (even more mounts may be available). These other types of mounts are available through RED.com or various third parties. Wooden Camera is also planning to introduce a line of lens mounts in the near future. Note that when using RED lens mounts, electronic control of the lenses will not be available.