You should know the drill by now: every year Apple announces new desktop operating system in June, and by the end of October, itll be ready for us all to play with. The latest release takes its name from the iconic Yosemite vertical rockface, El Capitan. While the changes dont seem that big on the surface, theres a lot going on under the hood that could make this incremental upgrade one of the most significant to date. Heres what Apple is adding to OS X in October.  What's New In OS X 10.11 El Capitan? (And How to Try it Yourself)