It's not all about MIX/Silverlight
So much else is also going on.
Longhorn Beta 3 with IIS 7 and PowerShell has shipped (importantly with a go-live licence)
https://www.iis.net/default.aspx?tabid=79 (IIS 7 go-live)
Visual Studio 'Orchas' Beta 1 is out in the wild (with LINQ, New Web Design Surface, ASP .NET Ajax, ...) it's a very significant release, we can't wait to get out there and show you some of the great new stuff.
https://msdn2.microsoft.com/en-us/vstudio/aa700830.aspx (summary of features)
But don't get the wrong idea form my post - Silverlight _is_ a big deal - so view the ScottG (Channel9) video to get the low down - it's only 36 mins long...