Apple's latest OS X El Capitan 10.11.1 beta 3, which was seeded to registered developers just yesterday, contains a number of references throughout which indicate the existence of a range of new accessories for Apple's Mac range of computers. The discovered references are pointing towards a Magic Keyboard, a Magic Mouse 2, and Magic Trackpad 2. These may well be the clearest indication yet that Apple could be planning on introducing some improved peripherals alongside the next Mac refresh.
