WinFX June CTP was released recently and Tim Sneath put up a post with some details on some changes you can expect to deal with in this release. Nothing major thus far. Personally I’m all for breaking changes during the beta phase if they improve the API in the long run. 🙂
The coolest thing in this release isn’t even an API change, but rather the addition of a visual tree view to XAMLPad! Totally cool and really helps you understand the difference between the logical and the visual trees.
Note: If you use Expression Interactive Designer religiously you probably don’t want to upgrade just yet as there hasn’t been a June CTP of EID release yet.