Announcement yesterday ,SP1 will be available to Technet/MSDN subscribers on the 15th with a general rollout taking place on the 22nd . build number is 7601.17514.101119-1850. the same version that leaked a few weeks back .completed in late december it was signed off mid January and leaked shortly after . no issues detected .
it doesn't contain anything particularly exciting. If you regularly take the Windows update files you will already have most of the content, which is a collection of fixes that have already been released.
Otherwise, there will be support for server-side facilities that will only be of real interest to network administrators.
I agree FE , its only a collection of the already released hotfixes and patches ,along with remoteFX and dinamic memory ,that should make life a little sweeter for those who like to take advantage of virtual technologies. nothing in it to be shouting about ,and why would there be ,Windows 7 is already remarkably stable ,and a far better OS out of the box than any previous OS has been . either way it will install for most who have thier updates set to automatically install, on or soon after the 22nd . I only posted as there seem to have been a lot of speculation regarding this release .
Yes if you have your PC up to date it will be small but there are still patches and one or two small tweeks to system files that improve system performance ,although many will not notice any difference . its not just a compilation of previous releases of patches and security updates ,you should still see a few mb of update involved even if you are up to date.