The biggest reaction from the crowd at WWDC yesterday wasn’t for a shiny new product or even a cool new app. Instead, the news that Apple was introducing its own programming language, Swift, got a full-throated roar of appreciation from the thousands of developers in attendance. Even without knowing a thing about programming, it’s easy to understand this is a big deal: Apple’s current language of choice, Objective-C, has been in the mix for Macs since the launch of OS X, and for iPhones and iPads from day one. For Apple to throw out the developer playbook across its entire product portfolio suggests there’s a big change afoot