Today Apple released OS X Mavericks Developer Preview 7 for those already on the beta software. The new preview doesn’t have any notable feature additions, but Apple has included several new wallpapers, one of which is pictured above.
Updates to the Mavericks beta have been pushed out systematically over the summer, and Apple will ship the OS to the public this fall. The September 10th event will focus on iPhones, and a separate media event is expected to take place next month. Apple could release Mavericks at any time this fall, but it’s likely that a release date will be given alongside new iPad/Mac hardware in October.