"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
New MacBook Airs to Feature Minor Processor Update
As can be seen in an image of the new entry-level 13-inch MacBook Air specs provided to 9to5Mac, the notebook will offer a 1.4GHz Intel Core i5 processor, a very minor boost from the current entry level 1.3Ghz processor in the 13-inch version. Build to order models in both 11 and 13-inch varieties are expected to see the same minor processor improvements.
The MacBook Airs continue to offer the same amount of storage space, RAM, and 802.11ac Wi-Fi, and there has been no upgrade to Thunderbolt 2, which was included in the latest Retina MacBook Pro. The Airs continue to use Intel's HD Graphics 5000 and it is unclear whether updated Haswell processors will bring any boosts to battery life.
It is unknown when Apple plans to introduce the new MacBook Air computers, but it is possible Apple will take its online store down tonight in order to update inventory ahead of an in-store release tomorrow.