updated 11:00 pm EDT, Thu October 14, 2010
Developer tool still in beta testing
Apple has released Xcode 4 preview 4 to developers for continued beta testing ahead of the official release. The programming utility features a new single-window interface, with an iTunes-style navigation bar for search functions and other list. The top offers a Jump Bar, allowing users to quickly switch between different levels.
The third preview was seeded to developers early last month. The latest preview is available for both Mac and iPhone program members. Apple has yet to announce a release date for the final version.