"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods Delay Attributed to Apple Ensuring Both Earpieces Receive Audio at Same Time [Updated]
While the exact reason for the delay remains unclear, a person familiar with the development of AirPods told The Wall Street Journal that Apple's troubles appear to be related to its "efforts to chart a new path for wireless headphones," in addition to resolving what happens when users lose one of the earpieces or the battery dies.
A person familiar with the development of the AirPod said the trouble appears to stem from Apple’s effort to chart a new path for wireless headphones. In most other wireless headphones, only one earpiece receives a signal from the phone via wireless Bluetooth technology; it then transmits the signal to the other earpiece.Last month, Barclays analysts said AirPods should enter production in December. Their research note said quantities would be limited to between 10 and 15 million AirPods to start. Meanwhile, an alleged email response from Apple CEO Tim Cook said AirPods should begin shipping over the "next few weeks."
Apple has said AirPod earpieces each receive independent signals from an iPhone, Mac or other Apple device. But Apple must ensure that both earpieces receive audio at the same time to avoid distortion, the person familiar with their development said. That person said Apple also must resolve what happens when a user loses one of the earpieces or the battery dies.
With just two weeks remaining in the holiday shopping season, some believe Apple should now wait until the new year to launch AirPods, in line with an early rumor about a January 2017 launch. The wireless earphones remain listed as both "coming soon" and "currently unavailable" on different sections of Apple's website.
Update: Apple blogger John Gruber says he's heard that manufacturing issues have delayed the AirPods, rather than a technical problem.
It makes more sense to me that Apple has run into a manufacturing problem, not that they discovered a design defect after they were announced.
"More difficult to manufacture at scale than expected" is also what I've heard through the grapevine, from a little birdie who knows someone on the AirPods engineering team. Things like what happens when you lose one or the battery dies -- Apple solved those problems during development.