This is hugely significant. The No.1 GPU vendor in the PC market has seen the writing on the wall, and is not standing still.
They clearly see the PC market in decline, and mobile/embedded is the way of the future, with Android as the dominant platform. Compare this to only a few years ago, when the Wintel duopoly reigned supreme.
For years, people have been talking about Linux taking on Windows on the desktop, but it hasn't really materialised. However, Linux has done something far more significant - leapfrogged the humble PC and become the platform upon which both so many Internet services and mobile devices are built. Exciting times...