Build 4002.Lab06 N(ntvbl06).030108-1926 is one of the first Milestone 4 builds. It, and also build 4001.main.021204-1515, uses the same desktop composition engine as Milestone 3 builds - 3706.Lab06_N.021029-1731 and 3718.lab06_N.021119-1730, which was also easly turnable in the Display control panel. One of the most important changes in M4 was introducing WIM format installation (the "15-minute setup"). Build 4002 however, was an exception and still used the i386 setup routine.
This build wasn't leaked but it was described on the Grabberslasher's UX.Unleaked blog.
