"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Pushes Snow Leopard Build 10A402 to Developers
This Snow Leopard Developer Preview Update is recommended for all users running the Snow Leopard Developer Preview Build 10A394 or later. This update includes general operating system fixes for stability, compatibility, and security.No word on what notable changes (if any) it brings. Mac OS X 10.6 (Snow Leopard) is the next major Mac OS X release to come from Apple. It is expected to bring many "under the hood" changes that could significantly improve overall performance across multi-core Macs.
Snow Leopard will ship in September and will cost $29 for current Mac OS X 10.5 owners. Meanwhile, those customers who have purchased a Mac since June 8th can receive Snow Leopard for $9.95 though Apple's "Up to Date" program.