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ASP.NET AJAX 4 adds to client-side data scenarios for both page and component developers. JSON data from the server can be rendered as HTML UI on the client in a highly manageable and efficient way, using ASP.NET AJAX templates.
A key aspect is support for ADO.NET Data Services.
You can try out. The bits, reference, samples, and source code are available on CodePlex at ASP.NET AJAX 4 Preview 4.
Also included on the site are previews to the updates to ADO.NET Dynamic Data 4.0, WCF REST Starter Kit Preview 2, Lightweight Test Automation Framework Update.