Most likely something like Qualcomm (or another similar vendor) saying that they refuse to provide the vendor kernel, and will just ship Windows on ARM instead.
Hmm, maybe they are referring to a specific branding used on recent models, e.g. a "Windows on Snapdragon" sticker similar to "Windows 8 Ready" and stuff.
Linux laptops still tend to be special order or niche brands, but there is nice positive traction in that space.
This is quintessential MSFT. I have absolutely less than zero doubt that there is a informal/formal agreement that they're called such. They always pull this crap. And then their OEMs realize later that the "Windows 8 Ready" sticker is almost more of a pariah.