Apple released today the public Beta 2 of OS X Yosemite. The new update is available at the MAC App Store via Software update. The new Public Beta 2 is nearly the same build as the Developer preview 6 which was released to Yosemite developers earlier this week.
The urgent software update affects the most recent two versions of macOS, El Capitan and Yosemite
The first ever automated Mac security update has been pushed out by Apple to Macintosh computers yesterday. According to Apple spokesman Bill Evans, the update is seamless and you won’t even notice it unless you are looking for it.
The latest update to OS X Yosemite, 10.10.1, appears to be causing some users to be unable to play YouTube videos in Safari. According to threads on the Apple Support forums and Google's Product forums, some users that attempt to play YouTube videos are seeing only black screens with audio clipping or are experiencing problems loading videos.
I'm liking the look of it so far, very user friendly.