Alongside releasing the 2nd beta for iOS 7 yesterday, Apple also released the second preview version of their latest OS for Mac.
Called Mavericks Developer Preview 2, it packs a few new feature when compared to the previous version including a new Airport Utility, iTunes 11.0.4 and updated Thunderbolt firmware.
Apart from that however, were not sure of many more changes to the OS.
However if you are a developer, you can try out the new OS for yourself by downloading it from Apple’s developer website, if you already have it however, the update should be available from the Mac App Store.
Source Cult of Mac