A lot of small tweaks and updates add up to a big win for iPhone and iPad users. iOS 6 is due out this fall. While hardware got a lot of attention at this year’s Worldwide Developers Conference (WWDC), the event is still really about software. That’s why Apple CEO Tim Cook and other execs offered up a slew of new details about OS X Mountain Lion — due out next month — and, more importantly, unveiled iOS 6, the next version of Apple’s mobile OS.