Now, he's gone ahead and released the beta XAP file for those of you with dev unlocked devices and Mango to side load. Of course he'd greatly appreciate if you could provide bug reports, insight, opinions, etc. so as to make the app even better. The current beta will work till September 1st at which point he'll update with a newer version, but you should also follow his blog for any new updates in the mean time.
We took it for a spin and even though it's just "beta" it feels pretty polished to us. Check out the video above where you can see the multiple Live Tiles in action, dual flip live tiles, feeds and get the over-all feel of the app. We're already really impressed with the new version and it's fun to see the power of Mango in action.