Yesterday we covered the 7048 screenshot leak but word reaches us that an x64 version of 7048 has leaked to popular torrent sites today.
7048 carries the build tag 7048.0.winmain.090219-1845 meaning it was compiled on the 19th February. According to the screenshots that leaked yesterday 7048 includes a tweaked start button, new icons for Notes, Paint and Calculator applications and Aero Peek is enabled on alt+tab.
7048 is a pre-RC1 compile of Windows 7 and is not likely to become the final RC1 build.