Hundreds of app developers swarmed Apple's Cupertino campus this week, some pausing to snap selfies at the Worldwide Developers Conference signs before racing to score deck chairs in front of the event's outdoor stage.
But while enthusiasm rippled through the audience before the keynote, with smartphones and hands held high, the usual cheers that greeted speakers sounded more subdued this year.
Those eager to hear developments in artificial intelligence may have been disappointed: Apple revealed it needed more time to supercharge its voice assistant Siri with the technology and unveiled only a handful of AI software features.
