Apple Seeds iOS 8.4 Beta 2
Apple has today seeded the second beta of iOS 8.4 to developers. This version comes two weeks after the first seed of 8.4. iOS 8.4 adds a new music app design. It has a more simple user interface. It also features some other bug fixes as well.
Developers can update to beta 2 in Settings > General > Software update > iOS 8.4 beta 2.