The original sprites are included, should anyone would like to revert to the exact
same look as before.
For the concise, but relevant "how-to" about the skin changes, I am awarding you some Telerik points, which you can see updated in your account profile.
I should also mention that we are preparing a blog post about this change, and we'll outline steps needed for successful skin migration / update.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed