The 13 inch Macbook Pro is a mistake, in my opinion.
When you look at the hardware, the interfaces, the resolution, there is nothing pro about those machines. They're simply aluminum Macbooks.
The pro line, aimed towards power users and designers, has features to support just that. When I'm doing my designing in illustrator or photoshop, or editing pictures in lightroom, I'd rather not have pathetic screen real estate and resolution when doing so.
So for people to complain that the 13" MBP isn't getting any love, there is a reason for that, because it should have never have came out. But instead of keeping the aluminum macbooks, they slapped pro on the case and decided to cash in.
Apple will give the 13" love in limited quanitites because the real designers and power users, and therefor the real profit and target audience, dont use them.