Here is a list of items I got from the WF Team at TechEd:
- No one has a silverlight management tool for tracking workflows – someone should build it and make some money!
- Activity Designers in 4.0 are in WPF!
- No more dependency properties everything is InArgument and OutArugment
- Current Expresson parsers are in VB only, future will be C# (when .net team gives em one)
- WorkflowInvoker class can be used to unit test your workflows! Sweet!
- WCF Activity is basically NO CODE!
- No need to build ServiceHosts anymore, everything is in Dublin!
- BEST PRACTICE: Always put logic in a class seperate from the activities! Basic SOA step!
- No Activity to Activity Binded Properties!
- PowerShell Activity is builtin!
- No Auto Terminate when workflow errors, you can have it start at the activity before – WOOHOO!
- Interop Activity will be used to host older activities (NOTE: there is NO ROOT WORKFLOW with a InterOp activity) – not clear as to if Interop will run in 3.5 or 4.0 runtime.
- Interop Activity is a synchronous call
- ETW is the new tracking database!
- You can create tracking participants
- There is a new Workflow Simulator! It was very cool looking! You can run through the entire workflow similar to BizTalk testing!
Also found this WF team blog has some more details:
I have downloaded the latest CTP. You should too! It will be the next hot thing!
Chris