Me too! I'm really hoping to see some battery life increases in the rMBP, but I also would like a quad core processor and Iris Pro graphics... We'll just have to wait and see what Apple decides for us.
An example of what I don't want: this laptop from System76 that is specced exactly like I want it, but that probably lasts 2 hours on a battery (52Wh for real? At least you can swap the battery...). On the other hand, if the rMBP gets the same graphics as the Air that would be very sad too.