OS X 10.10 Yosemite announced

Named after the California national park, Yosemite will be available later this fall, and end users will be able to sign up for a public beta program in the summer. As with Mavericks, the Yosemite update will be free.
Apple software chief Craig Federighi showcased new “translucent materials” in the redesigned operating system, which also features bright colors and new icons. The translucent material extends to many areas of the operating system, with a demonstration showing it reacting to the background image in the sidebar of Messages and Finder. The effect is similar to the translucency introduced in iOS 7.
Apple also focused on “precise and consistent” fonts throughout the OS, eschewing their traditional Lucida Grande typeface in favor of a new sans-serif that appears to be a Helvetica variant.
Yosemite also comes with a new “dark mode,” which turns the normally-light gray menu bars and dock to a darker gray, while Notification Center has been updated with a new Today View that can be extended with widgets and apps from the Mac App Store.
It’s not yet known whether the appearance of widgets in Notification Center spells the end of the Dashboard. One of the widgets shown during a demonstration was ESPN SportsCenter, long a popular Dashboard widget.
Safari also gains HTML5 Premium Video, which supports services like Netflix without plugins, adding up to 2 hours of additional battery life during playback.
Additionally, new Continuity features in OS X add greater integration between iOS and OS X. Macs can now automatically configure hotspots from connected iPhones, for instance, and both operating systems give users the ability to automatically continue working across devices in first-party apps like Numbers and Safari.
Continuity also extends to phone functionality. SMS messages can now be sent and received in Messages on the Mac, while OS X also allows users to make and receive phone calls from their laptop or desktop.

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