A new build of Windows Vista has leaked, a week before the new build is expected to be released to testers.
The October CTP build released to testers will incorporate additional functions than this leak, whilst likely retaining the same build number.
Released with build 5231 are Windows Media Player Version 11 (still under the guise of Windows Media Player 10), which includes a smart new interface, and the latest Beta of Internet Explorer 7, with tabs adopting the more conventional 'below the address bar' style. New sound features are added with active output and input monitors, so hopefully previous sound problems have been resolved.
See the three screenshots below, thanks to Chris123NT for supplying these.
View: Microsoft Windows Vista