The internal builds are only introducing fixes for our latest official build. All new major features and new development that we have implemented since the last official release will be part of the beta release that is coming pretty soon! I am planning to create a blog post that will introduce all of the new major features introduced in the new CoverFlow control in order to save any adoption and learning curves. If you have any questions or suggestions concerning the new CoverFlow feel free to share your thoughts with us.
the Telerik team