From the Blender Development Notes on May 3, 2015:
"Our very active OS X platform maintainer for many years, Jens Verwiebe - had a suprising statement. He's going to abandon OS X as a serious 3D/graphics development platform. This, he said, because of lack of quality GPU support (OpenGL, OpenCL) and annoying Yosemite glitches. It makes this platform too painful to keep using seriously. Jens will stay around for at least the 2.75 release. Martijn Berger volunteered to take over duties."
The original post is here:
IMHO, although they say that they have another maintainer stepping in, the phrasing alone does not fill me with a whole lot of confidence that Blender will be around long-term on the Mac. I COULD be wrong and hope that I am.
First, the possibility that Modo might go to Ad*b*/A*t*d*sk, and now this...good thing I've still got an old copy of Lightwave.