"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Seeds Seventh OS X 10.10.3 Yosemite Beta to Developers, Public Beta Testers
The new beta, build 14D130a, is available for registered developers through the Software Update mechanism in the Mac App Store and through the Mac Developer Center.
In today's beta notes, Apple has added Safari and Mail as focus areas for testing, in addition to previous testing areas that include Wi-Fi captive networks, screen sharing, and Arabic/Hebrew system languages. The known issues section lists just one remaining issue with missing thumbnails when using Time Machine to restore a Photos library upgraded from Aperture.
OS X 10.10.3 includes several new features, like the Photos for OS X app. Designed to integrate with iCloud Photo Library and the Photos app on iOS, the Photos for OS X app is a replacement for both iPhoto and Aperture. Reviews have suggested that while Photos is a suitable replacement for iPhoto, with more advanced tools and performance optimizations, it may leave professional users disappointed in its initial incarnation.
Along with the new Photos for OS X app, earlier OS X 10.10.3 betas have introduced a redesigned emoji picker that consolidates emoji into a single scrollable page with clear labels, new diversified emoji and emoji skin tone modifiers, new flag emoji and updated emoji for the iPhone, iMac, and Apple Watch, and support for Google 2-step verification when setting up accounts in System Preferences.
With the fifth and sixth OS X 10.10.3 betas, there were just two minor bug fixes, and today's update likely includes similar small changes. Given that we're on the seventh beta, OS X 10.10.3 is undoubtedly getting close to completion and we may see a public release of the software in the near future.