WCF RIA Services V1.0 SP1 Beta along with WCF RIA Services October toolkit are now both available and ready to go live. You can download them from http://silverlight.net/riaservices.
Check out these blogs for all the details.
Later this week I will be looking deeper into two new features; EntitySet and EntityCollection binding support and Windows Azure Table Storage integration. Stay tuned because this new stuff is awesome.