"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Seeds OS X Snow Leopard Build 10A411 to Developers
The new update weighs in at about 750 MB, considerably smaller than last week's 1.3 GB update. Specific changes in the latest build have not yet been revealed.
This Snow Leopard Developer Preview Update is recommended for all users running the Snow Leopard Developer Preview Build 10A402 or later. This update includes general operating system fixes for stability, compatibility, and security.The public release of OS X Snow Leopard is slated for September, and the update will cost $29 for current OS X Leopard owners. Users who purchase a new Mac between June 8th and the Snow Leopard release can receive the updated operating system for $9.95 though Apple's "Up to Date" program.