That's what I've been saying since June also.
That i actually wished that the rMBP wouldn't come until October.
Because I really do think that if it takes that long it would get much bigger upgrades then just CPU/GPU/SSD/WiFi.
The longer it takes the more likely i believe that we will see much more.
Because if those where the only upgrades it would probably already be out and could have been a silent upgrade.
But now it looks more and more like a presentation on an October event.
And we could be lucky and see things like: IGZO, re-design, TB2 or other stuff.
If it only gets the same upgrade as the Air, I really cant see why its been taking so long.