The biggest revelation I've seen from the newly published information so far is that Microsoft officials are now using "Microsoft Design Language" as the newest way to refer to the design language and tiled style formerly known as "Metro."
I had a number of my Twitter chums tell me in the past couple of weeks that Microsoft was now using "Microsoft Design Language" as the replacement for Metro, but a Microsoft spokesperson would not confirm, when I asked, that this was the official new lingo. (I believe Brent Schooley was the first to tell me Microsoft Design Language was the final replacement on which the Softies had decided.) I guess Microsoft's use of it on the Build 2012 site is as close as we'll get to an "official" confirmation.
Microsoft Design Language seems to be the way to refer to the look and feel/UX, but it isn't the replacement for what formerly was known as "Metro-Style" -- meaning applications built around the WinRT application programming interface (API). Metro-Style's replacement is "Windows Store," as in "Netflix has built a Windows Store app for Windows 8."
Microsoft officials never did publicly acknowledge the reason that the company decided to drop all references to "Metro" was due to a spat with German conglomerate Metro AG, but that is widely believed to be the reason Microsoft execs are phasing out public use of the term. Microsoft officials have only said that "Metro" was a codename never intended for external/public use. (Yeah, I'm just the messenger. I don't believe that, either.)