Apple has released OS X Mavericks Developer Preview 5 for registered Mac devs. The release includes bug fixes and feature enhancements, and all users who are running Developer Preview 4 are recommended to update to the newest version.
The fastest way to download and update to Developer Preview 5 is through the Mac App Store, where it runs between 1.5GB and 3GB depending on the Mac being installed on.
Developers who have held off on installing Mavericks beta versions thus far can access a code through the developer center to install DP5 directly without having to update from the prior version. This also allows you to create your own bootable Mavericks USB installer out of a flash drive, but it must be done before Mavericks is actually installed.
The final release of OS X Mavericks is expected this fall and includes many new features and enhancements for Mac users. Though the precise release date is unknown, it will likely be launched near the public release of iOS 7, which is largely expected sometime in late September or early October.