I would assume that its in the works, but they already slapped developers in the face yesterday with new restrictions, if they added pricing plans on top of that, that would be inhumane and too much for developers to handle in on gulp.
Additionally with the pricing, its hard to get right. They won't be able to modify prices as they see fit after they announce them. So it seems like a logical progression: 1 restrict amount of data. 2 next, determine pricing