Earlier quoted context omitted.
Do you mean Aero Glass from Windows 7? Metro is a flat design that looks nothing like this.
I assume they might be talking more to the "universal design" aspect. Though Apple has long had a universal design across platforms. Not always in lockstep, but visual traits and behaviours and traits and appearances end up in all of their platforms, which even if it wasn't logical from a design perspective, there is loads of shared code so it's inevitable. But really a lot of what they showed today reminded me most…
Everyone was keying on the universal design thing, and the seeming importance of "introduces" as if this is a first, and it was such an odd thing for Apple to denote given that they have been using a universal design for a long, long time.