updated 04:53 pm EDT, Mon July 22, 2013
Changes yet to be uncovered
Apple is seeding a fourth Developer Preview of OS X Mavericks, users note. Any significant changes have yet to be identified. The new beta is arriving just under two weeks after the previous one, which went out July 9th.
The finished version of Mavericks is due to ship sometime this fall. It will introduce a variety of features to OS X, such as Finder tabs, Mac versions of Maps and iBooks, and technical improvements like App Nap, compressed memory, and expanded multi-monitor support. Apps like Calendar will ditch the skeuomorphisms that limited their interfaces.