As much as I'd like to believe the rumor sites, and despite how dead on they've seemed to be lately, I wonder if Apple would have put in all the work updating the 13" if they knew they were going to introduce a retina model a mere four months later.
Then again, they may do like they did the 15" model, and release them side by side.
A good way to figure out a price would be to configure a 13" current model with 8 gigs and a 256gb ssd and deduct $100 or $200 from that, as they did with the 15".* By that reasoning, the price would be $1600 to $1700.
*So that way, they and all the reviewers can say, "Hey, it's pricey, but it's still cheaper than a similarly spec'ed classic model!"