Yes, we are done with v1.0 !! An hour ago we released WCF RIA Services V1 to the web. Both the WCF RIA Services Toolkit and WCF RIA Services V1.0 for Silverlight 4 and Visual Studio 2010 are live on the Microsoft Download site :-)
The official product information is available on http://silverlight.net/riaservices as well as a Channel 9 video with Dinesh and Nikhil announcing WCF RIA Services v1.0.