Apple is getting ever closer to the public release of OS X 10.9 Mavericks with the sixth beta it has released to developers. These preview versions of Mavericks give developers the chance to hunt for bugs and other problems, as well as test their own apps, before Mavericks is officially released this fall.
OS X Mavericks Developer Preview 6 is out. We're still waiting for this logo update.
So far we aren't hearing word of big changes in Developer Preview 6. In contrast, Developer Preview 5 added iBooks support. Apple said Mavericks would include iBooks support, but until DP5 was released that feature was still missing.
OS X Mavericks includes several new features in addition to iBooks support, such as improved full screen app support, desktop spanning support for AirPlay through Apple TV, better overall performance and battery life, file and folder tagging, iCloud Keychain syncing, Maps, and more.
Early access to OX S Mavericks requires an Apple developer account. Apple hasn't said exactly when Mavericks will ship, but did promise it will be coming this fall.