Based on the release of MVC 1, there were a lot of previews before the final version. The initial ASP.NET MVC 1 Preview 1 was very different from the final version. The final MVC 1 Preview 5 was very similar to the final release, very little different (if at all), and I think the main difference was the bug fix.
While MVC 2 is a refinement of MVC 1, it has some important new initiatives (e.g. areas), and there is no guarantee that how the current MVC 2 Preview 1 works, how the final product works. If you need longevity in your production system, I would really not recommend using any preview product in production capacity unless you want to deal with possible significant changes in the final version.
Note ... if you save your production system with a subsequent release of the preview, this should facilitate your final migration to the final version of MVC 2.
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