Looks like Microsoft is planning for a rollout of Windows 7 Service Pack 1 (SP1) a few months into the official release of the best ever operating system from MS.
Both Softpedia and Neowin have confirmed that the SP1 for Windows 7 is scheduled for somewhere in July. A set of leaked screenshots is doing the rounds of the internet, courtesy Muy Windows (translated to English). Here are few of the screenshots from a non-English version of the SP1.
Apparently the Windows 7 SP1 is less than 150MB in size, which is good considering that service packs for Windows Vista have been much larger than this.
The build numbers for the SP1 is rumored to be somewhere between 7600.20500 and .20700. A beta release is expected in July 2010, so you can except a lot of changes to happen in between now and then.
Apparently this build fixes over 150 issues. However, users should not be troubled about the late release of the SP1, since Microsoft usually releases regular patches through Windows update. The SP1 contains most of the released patches and new ones in a single bundle.