Anyone else confused by Microsoft slithering their way into this press release? I can imagine they find this to be a PR coup, and worked very hard to be a "part" of the announcement - perhaps even paying their way in. I find it ... "classless."
It's a press release. Getting annoyed at marketing in a press release is like being angry at water for being wet. Save your anger for the "journalists" that copy/paste the release into an article so they can make their deadline.
Apple's buying power is so immense that they transform whole markets. They're buying most of the world's Flash memory and creating worldwide shortages of CNC machining capacity. Apple are likely to be the single biggest purchaser of Gorilla Glass, so it is very much in Microsoft's interest to ensure that good supplies are available for other OEMs. They can negotiate on behalf of "everyone but Apple" in a way that no-one else could.