It is not everyday, that you see an announcement on Silverlight Team Blog signed by three Microsoft Developer Division VPS (Walid Abu-Hadba, Scott Guthrie and Soma Somasegar) but it happened last night.
MIX is about a week away and a beta of Silverlight 5 will be shipped, but I think the main focus will be on IE9 and HTML5 tooling(I hope).
I personally look forward to some great tooling from Microsoft for HTML5. These tools will be years ahead of any other companies tools.
Exciting Times.