Steve: I think comments about lack of Sony lenses refer to exotic telephotos since the marketing for this camera is aimed for that genre of photography. Of course there's nothing stopping you using it for other types of photography but you gotta wonder how soon the A9r and A9s's gonna make their appearance.
MM: I'm sure it's in the works and I'm sure Canikon already know something about it too, as they would've known about the development of the A9. But I read somewhere that lenses take something like 4 years to develop (can't recall if it was for a normal or exotic lens), and the manufacturing of exotics lenses take something like a full year. So its gonna take some time to flesh out the big teles.