Do I Need to Rewrite My Tests for the New API?

NO!

We are releasing our new API in addition to Reflective and Natural mocks.

Everything you have will work just the same. Especially folks who work with .Net 2.0 – you don’t really have a choice but stay with the current API set, since the new APIs are built on top of Lambda syntax which is only available with VS2008.

We do encourage using the new API. We believe they are cleaner and will result in more maintainable and readable code. I encourage all of you to take a look at them and give us feedback!