OS X Mavericks Developer Preview 2 is now available to download in the Mac App Store.
The second version of the prerelease software, which upgrades developer Macs to OS X 10.9 “Mavericks” ahead of schedule, appears to add a new Airport Utility (6.3), a Thunderbolt Firmware Update (1.2), and an update for iTunes (11.0.4).
Apple notes at its developer website:
This is a pre-release version of OS X Mavericks. OS X Mavericks Developer Preview 2 is available as an update from the Mac App Store for Macs running OS X Mavericks Developer Preview.