GateKeeper will not arrive on iOS, rather the converse will happen. Apple will lock down OSX. You will need a developer license to install 'non-approved' software. The success of iOS has demonstrated to them that people like velvet handcuffs. If you have any interest in open platforms you should not be giving Apple your money, and should be doing what you can to explain the dangers to others.
See, that’s what FOSS zealots keep telling me, but I don’t buy it. The day Apple jails the Mac is the day they turn OS X into OS Xcode, because that’s the only professional software people will use on it anymore.
Adobe, Autodesk, Microsoft, and other enterprise companies will never agree to a 30% Apple cut for their Mac software, and Apple will never allow their kludgily-accreted codebases onto the App Store. Apple’s executive team may have the balls to cut all these companies out of the platform, but they’re not stupid.