"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Mac OS X 10.6.2 Build 10C531 Seeded to Developers
We noted yesterday that the user guide for Apple's new Magic Mouse makes reference to Mac OS X 10.6.2, suggesting that Apple is building direct support for the new mouse into the update and expects to release it in the near future. Users running earlier versions of OS X (10.5.8 through 10.6.1) will have to install a separate software update to support the Magic Mouse.
Mac OS X 10.6.2 also reportedly fixes a serious bug that has resulted in some users losing all data from their login accounts.