So they are basically waiting for the right iGPU to be available...maybe we will see the 12" MacBook and 13" MBP updated at the same time around October.
Don't think so. I think Apple is killing the nTB MBP altogheter.
First of all to push the TB, because given the lukewarm reaction to the TB, if they had both nTB and TB versions out no one (or a lot less people) would have bought the TB one. The same reason why there is not a nTB 15" MBP version.
Second, they want to introduce a new MBA, and in 2016 they introduced the nTB like the "ideal MBA replacement".