Like Mark Harsh is writing on his blog [1] the new February CTP of WPF/E is live. Download the Windows [2] and the Mac [3] version, but keep in mind that there is a change in the aghost.js for the new version, see more details here and download the changed JavaScript file [4]. Joe Stegman is writing [5] about some changes:
More details, an updated SDK and updated samples will be posted soon on Microsoft's landing page [6] on MSDN.