Semi Off-topic: I took my money I planned on spending for the iPhone which I did not buy and a possible MacBook and invested it in British Pound Sterling.
If I'm lucky, my next hardware purchase will be "for free".
I decided to wait it out, because it's already too late.
In a few weeks we literally have to care about Christmas preparations and I certainly want to wait for real world data from buyers.
I do believe it will be disappointing. It will be marketed as the greatest design with OLED bar and Touch-ID, but my guess is we might be seeing lower performance compared to the competition.
If Apple puts s 5k Retina display in the. 15", the GPU will be maxed out before even driving an external display.
Low power Skylake is not that much better than older models, because most Apps aren't optimized ayways.
I just care about ports and gpu options.
I might even passband wait until next year, regardless of the potential release date.