agreed a 13" rMBP with the same insides as the $2199 15" would cost about $1999, thats why I think it will have less power and be priced around $1799
I don't know if the smaller form factor can support the same "insides". For instance, the battery would have to be smaller, but then again, it could be smaller because the screen is smaller, so a battery as large as the one in the 15" model isn't needed. That would reduce the manufacturing cost of the 13".
But, then again, manufacturing cost of a system isn't directly related to the sales price, either, since it's the marketeers who decide what the price point should be.
But... in thinking about this, if you ignore the actual piece part manufacturing cost of these systems (I know, this is factored into the sales price, but bear with me here), then ultimate sales prices for the systems are really dependent on where the consumer tolerance levels are from the marketing perspective.
Look at the 13 inch classic MBP. The base model is priced at $1199, and the high-end model is $1499. Oddly enough, these are the exact same prices as the same models of the 13 inch MBA.
But, when the 15 inch cMBP (at $1799 and $2199) is compared to the Retina MBP (at $2199 and $2799), that's an 18 percent and 21 percent difference respectively. If you assume the same proportionality here and apply those percentages to the 13 inch classic MBP pricing, to approximate what a 13 inch Retina MBP might be priced at, given the marketing perspectives, you get $1414 for the base package and $1813 for the high end package.
Or, when you factor in buying psychology being tuned to "99" levels, which Apple evidently subscribes to, you get $1399 and $1799. I bet that's where we come out when the 13" rMBP is finally announced.
That's a long way of saying that I agree with at least your high end pricing. But not entirely with the pricing in the AB article I linked to earlier. They used the absolute price differences between classic and Retina models to estimate the sales price of the 13 inch rMBP, but I used the relative price differences (percentage) instead.
Aren't spreadsheet exercises wonderful?