The release notes, as always, can be found here:
http://www.omnigroup.com/ftp/pub/sof.../releasenotes/
If a SP comes out and you don't see the notes on that page, it's probably because they're in the process of updating them. The chance of getting a response with the answer to a thread before the release notes get updated, I'm guessing is slim to none (and slim left town last week.)