Now there is a News that Windows 7 Build 7105 has been leaked. The string for this build is 6.1.7105.0.090404-1235_x86fre_client_en-us_Retail_Ultimate-GB1CULFRER_EN_DVD, and it was compiled on April 4th.
Windows 7 Build 7105 Details
Version: 6.1.7105.0.090404-1235_x86fre_client_en-us_Retail_Ultimate-GB1CULFRER_EN_DVD.
File size: 2.58
Changelog
In my opinion it will be released this week(At least x86). And you will be able to download it. I will be waiting for x64 version
You can find latest news about upcoming windows operating system Windows 7 from windows7.net