With OS X Mavericks, Apple showed it still had tricks up its sleeve regarding desktop operating systems. Long-time apps like Finder got welcome upgrades and rubbed shoulders with newcomers from iOS, such as iBooks and Maps. Multiple display support was given an overhaul, and iCloud Keychain made its debut, to help Mac and iOS users keep regularly used online details safe.There were big improvements to battery life and app efficiency, and to ensure everyone with a supported Mac could upgrade with a minimum of fuss, Apple scrapped price tags entirely, making Mavericks the first free major OS X update.But what happens next? When will the successor to Mavericks appear, and what will it offer? What will it be called, and what will it look like once Jony Ive's got his claws in deep?