In case you haven't seen it, we've published our roadmap for ASP.NET AJAX on Codeplex and there's an associated thread for feedback here. If AJAX is your thing then please have a read and provide feedback - now's the time if you want to steer the shape of future releases.
The roadmap runs to 10 or so pages so I wont try and summarise everything here but it includes proposals such as improvements to the DOM APIs including support for native querySelector APIs, client data and UI templates (remember xml-script?), client data sources, accessibility enhancements (make it easy to implement accessibility), animation and drag & drop support, integral client-side components, ASP.NET MVC support as well as several tool enhancements.
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