"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
WWDC to Be Held June 13 to June 17 in San Francisco
The official WWDC dates have leaked courtesy of Siri (via 9to5Mac), who, when asked when WWDC will be held responds: "The Worldwide Developers Conference (WWDC) will be held June 13 to June 17 in San Francisco. I'm so excited!"
While today's information counts as official confirmation that the conference will be held from June 13 to June 17, the dates in question were already known based on scheduling information at Moscone West. Since January, the Moscone Center has been booked for the first, second, fourth, and fifth weeks of June, leaving only the third week open for Apple.
Given that Siri is providing information about the Worldwide Developers Conference, the ticket lottery for the event is imminent and could go live as soon as tomorrow. Due to the popularity of the event, Apple offers each $1,599 ticket to developers based on a lottery system.
Apple's annual Worldwide Developers Conference is of interest to developers because it gives them a chance to interface with Apple engineers and attend a wide variety of instructional websites to learn methods for improving their apps. For non-developers, the Worldwide Developers Conference provides a first look at new versions of iOS and OS X and is also often used as a venue for introducing new products and services.