Nice set of updates. It'll be interesting to see if Microsoft's marketing department starts loving Windows Phone as much as its few customers do.
Also, they confirmed what I had heard internally - the middle ground between existing devices getting or not getting Windows Phone 8 - it's not cut-and-dry. Existing devices will get the "7.8" update which includes the new start screen and some other WP8 features.
Seems equivalent to me of when Apple brings iOS to old devices, even though it's missing things like Siri, turn-by-turn directions, and other features.