I remember hearing that rumor around the time of the NAB announcement, too, but to the best of my knowledge it's incorrect.
As stated in the BMCC product page on the BMD website, and in the BMCC user manual, the camera features 2 analog balanced audio inputs, compatible with mic or line level sources, via a pair of 1/4" 3-conductor TRS jacks. The BMCC does not supply phantom power to external audio devices.