If you are a member of the Longhorn Server beta program there is a nice suprise in store for you this evening.  Microsoft has posted the April CTP for your testing pleasure. Again the build number is in the 6001 series of builds, 6001-16497-070330-1720 to be exact.

 0x238801E6      wsl_6001-16497-070330-1720_x86fre_server-KB3SFRE_EN_DVD.iso
 0xB27FF9A0     wsl_6001-16497-070330-1720_x64fre_server-KB3SxFRE_EN_DVD.iso

Source:→ Windowsconnected

Microsoft, Windows Longhorn Server, CTP, Preview, Beta, Testers, Beta Testers