Ok, I thought the blogging embargo on this wasn't going to be lifted until mid-next week, but since everyone seems to be posting about it, I'll add my two cents: yes, it's amazing, and yes, we've known about it internally for a little while, but couldn't share anything externally.
Tony has a good summary on his blog, so I won't re-write the whole thing here, since you can just go read his post on it, except to add this: no other company has the resources and technology to launch an infrastructure like this.
I got to see this in action, just a little big, back in January. It's going to be so cool.
<edit: Tony's link is gone (maybe he had to take it down?), so I'm linking to Jeff instead, as he's got some info Tony's link is back up>