We released the WinFX January CTP this morning along with some associated Go-Live licenses. As Karsten mentions in his post, there are no changes to WPF between the December and January CTPs, and in fact, they're binary compatible. Here are links to the bits:
Note: If you have a prior version of the Windows SDK on your machine, not only do you need to uninstall the SDK, but you also need to uninstall the Monad and Compact Framework bits. I ran into this problem on my machine, and it took me a moment to figure out, so save yourself the potential confusion.
For some extra reading, check out related articles from CRN, ZDNet, eWeek, and Computerworld about today's release.
Last, but not least, for those who are using my Adobe Illustrator to WPF/XAML Export Plug-In, you'll be happy to know that the current version works just fine with the January CTP.
Mike Swanson blogs : " We released the WinFX January CTP this morning along with some associated