See the release notes at - http://websharper.com/blog/2011/7/641
Some of the improvements include:
* WebSharper metadata information is now bundled with the dlls.
* Different JavaScript generation depending on Debug and Release mode.
* Support for Async.Parallel and Async.StartChild.
* Better support for constructing JavaScript object literals.
Cheers,
Joel (on behalf of the WebSharper team)