Will we support dynamic languages? Great question!
For the upcoming preview we haven't added any features that are specifically designed for dynamic language support. However, we have made a bunch of changes for the upcoming preview that should make using dynamic language a lot simpler. For example, dynamic languages don't like using type objects (that is, of type System.Type) so we changed a lot of our code to work off of instances of objects instead of types of objects.
Our product planning does have a big line item for the next milestone to investigate what it will take to have full support for dynamic languages but we're not quite there yet. Hopefully most of our features in MVC will already work in the upcoming preview.
Thanks,
Eilon