While surfing around on the internet, we located something quite unusual. Buried within several technical videos was a Windows Vista build of 6429.fbl_multimedia_media.070514-1730. We won't bother speculating as to what this build represents, but word is spreading that this could be an early developmental build of Windows "7" (or a dogfood SP2 build). A UAC prompt within the Local Training demo shows the build as being a WEX build.