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.
Changes Reported;
1. Improved networking support, the work in the local network
2. Added support for some previously incompatible programs
3. Extras in the LP (?) and small cosmetic interface improvements
4. Added support for new drivers for various devices
5. Extended support sensory displays
6. A small optimization and changes in the kernel
More At; http://www.neowin.net/news/main/09/04/06/windows-7-build-7105-rc-escrow-reached

............................................................................................

EXPERIENCE IS NOT WHAT HAPPENS TO A MAN BUT IT IS WHAT A MAN DOES WITH WHAT HAPPENS TO HIM