Service Pack 1 (RTM) for Windows 7 and Windows Server 2008 R2 has been leaked to the Internet.
The build string of Service Pack 1 RTM is 7601.17514.101119-1850 which indicates it is compiled before two months.
The fact is that the service pack contains updates to windows system files & there will be no gui or visualisation changes after installing it.
We recommand you to not to download the leaked version they might come with some infection of malwares.
So wait untill microsoft will officially release it. 🙂