The WF team has released samples and source code for a state machine (with designer) and some ADO.NET activities.  These are not fully supported code, but do provide you with a glimpse of what Microsoft is planning in these areas, and provide you the ability to give feedback on the implementation. I’m interested to check these out as I’ve got my own runtime, but not design-time state machine implementation that I like. It will be fun to see how it compares.