微软公布了.NET4.0的宏伟计划，今天从http://www.microsoft.com/net/dublin.aspx下载了Dublin__NET_4_overview.docx文档，里面介绍了.NET4.0的部分功能。下面是和WF相关的。
Significant improvements in performance and scalability
• Ten-fold improvement in performance
New workflow flow-control models and pre-built activities
• Flowcharts, rules
• Expanded built-in activities – PowerShell, database, messaging, etc.
Enhancements in workflow modeling
• Persistence control, transaction flow, compensation support, data binding and scoping
• Rules composable and seamlessly integrated with workflow engine
Updated visual designer
• Easier to use by end-users
• Easier to rehost by ISVs
Ability to debug XAML
没必要翻译了，可以看出WF4.0中的改动还是比较大的。