The article I've linked is from January, I wanted to show that AMD has been hinting at mainstream for awhile. But since then they have clarified further: AMD’s Polaris will be a mainstream GPU, not high-endBut his quote seems to hint that Polaris 10 or 11 will be a "larger, high-performance GPU designed to take back the premium graphics card market" and the other for laptops/entry level desktops. This is a little different wording than has been repeated around here that Polaris was never meant to be a high performance part.
"AMD is working on two versions of its upcoming Polaris graphics architecture: Polaris 10 and Polaris 11. In an interview with VentureBeat, graphics chief Raja Koduri explained that one of those GPUs is aimed at thin-and-light laptops and entry-level desktops, while the the other is a larger, high-performance GPU designed to take back the premium graphics card market currently dominated by rival Nvidia. However, the overall target for Polaris is still "console-class gaming on a thin-and-light notebook."