Update: See our follow up to this story with some new information.

Microsoft's Joe Belfiore just chimed in on Twitter noting that today isn't Mango day.  Still, we can't help but think of all the odd coincidences today--official Foursquare app, Flixster, Rocket Riot, Taiwan getting an update, Microsoft calling for devs to update their asap, the last day of BUILD '11 in California and more that something wasn't suppose to happen around this time.

However, Joe knows what Joe knows so we have to take him at his word. So our chances for a Mango release or announcement today are not good. But maybe...