I think we'll see the new pros Sep 20 or mid Oct. The 20th is because of the fact that the back to school sale ended on the 6th and apple has a 14 day return policy. Putting a pin on the 20th. But that is unlikely because they will most likely do it with the new iPads. I also think the new pros will only have retina display, and won't have IGZO. Usually apple brings the new flashy tech to the Mobile line first. So well see a IGZO MBP next year after the six is released, most likely. Now one aspect I can't figure out is the super drive. Apple stated they won't 86 it yet due to the fact that to many uses have use for it. I also don't see then holding on to the legacy pros. They could squeeze a drive in the rMBP, but that would be quite the challenge. Oh and sorry guys, PHILLY boy here. I see a ID scanner on the Mac line eventually, and it would make sense for the MBP to have, but I would not count on it this year.
The 20th sounds like a stretch but that would be nice.