From spy photos or BMW web site pics:
Black (which black not noted)
From uncorroborated "sighting":
"Burgandy" (Royal Red? the Road and Track purple convertible pic?)
Fern Green (refernce to this color observed on dealership
"Lavender" - the Road and Track pic of the convertible which does not look a photograph to me - looks more like a sketch.
Unclear to me about the status of Carbon Black.
IMO if the above is close to accurate, it seems we are getting a well rounded selection, even if some of the most populars are not there.