Just tested NX2 with OS X Mountain Lion
Seems to work just fine. It wasn't an exhaustive test, but enough to give me a warm tummy feeling. I'm happy.
-- edit --
Just saw the other thread. Mods, feel free to move or delete this post if you like.
D800, D750, N1-J5, N1-V3 (and a few other cameras) and a BIG handful of lenses.