In a blog posting, Microsoft VP Mike Nash said that while Microsoft is offering the customer preview program to all interested parties, not everyone should download SP2 in test form.
"The (test version) is intended for technology enthusiasts, developers, and IT Pros who would like to test Service Pack 2 in their environments and with their applications prior to final release," Nash said. " For most customers, our best advice would be to wait until the final release prior to installing this service pack.
Mike Nash Blog
Via: Cnet
If your a Technet subscriber, SP2 is already waiting for you.