The WPF/E SDK [1] (February CTP) is now available, you can download the files from the MSDN web page [2]. The WPF/E QuickStart is not yet available as download.
If you didn't see this: Renderspace [3] and Microsoft Slovenia have created a very nice example using WPF/E to simulate Windows Vista. Ok, there are a lot of things still missing, of course, but it is very nice to see: http://www.vista.si/ [4]