Microsoft officials rolled out the delivery timetable for .Net RIA Services via a blog post: ‘Another CTP test build (without a Go-Live license) is coming in July ; A beta is coming in November, timed with the Professional Developers Conference. This will add more support for Visual Studio 2010 and .Net 4.0 ; Release to Web: “First part of 2010”’. .Net RIA Services is designed to allow coders to bring together the .Net programming model with Microsoft’s Silverlight competitor to Adobe Flash. Microsoft made a Community Technology Preview (CTP) of the technology available in March, but didn’t provide any final availability information.
Source:→ All About Microsoft