Our buddy Bink reports over at bink.nu that there is a new build of Windows Server Codenamed "Longhorn" has been made available to testers. This will be the first beta build of v6 kernel since the finished Windows Vista that released to manufacturing on Nov 30th carrying the build number of 6000.
From Bink's web site: "There's a new build up on the ongoing Microsoft Longhorn Server beta program. It's the next build up from 5600 which was available back in August. This current build, 6001.16406 will be on Microsoft Connect very soon."
Update Source: ActiveWin
Microsoft released the December CTP of the Longhorn Server on the Microsoft Connect Website. Microsoft released both regular and checked builds, symbols and WDK. The versions range between 1.6 - 2.4 GB.
* 0xA027DE97 wsl_6001.16406.061208-1900_x86fre_server-KB3SFRE_EN_DVD.isoLink: Connect
* 0x6337F934 wsl_6001.16406.061208-1900_x64fre_server-KB3SxFRE_EN_DVD.iso
News source: Bink