The hype is here (preview-version).
I won't repeat the claims made by Microsoft here, but the RIA acronym remains with .NET and Silverlight - but: Visual WebGui (VWG)
is the .NET RIA solution that Microsoft has been trying to achieve with Silverlight but with one significant difference: VWG unlike Silverlight opens the new cross-platform, cross-browsers HTML5 horizons for Microsoft .NET developerswhich is another way of saying bye-bye Silverlight.
Curl's CAEDE strategy is to place Curl in the developers' hands but to leave the Curl runtime off the users' device. Hmmm.