Just to be clear the 15 Sep release date is the current date for the Steam release (subject to change.) The 1.9 release is hopefully no more than weeks away at this point...
Doesn't it cross your mind that v2.0 could get delayed just like 1.9? I think v2.0 should be delayed so we get a more packed update unless they're just planning to make the jump from 1.9 to 2.0 a minor bug-fix patch rather than a major release.