Yosemite is the second version of OS X since its reboot last year, when Apple switched from naming its annual OS X updates after big cats to places in California. It also neatly side-stepped the problem of where to go after 10.9 by avoiding the use of numbers altogether (although they do still exist in the geekier parts of the OS like System Information, where Yosemite is referred to as OS X 10.10).
So, what's new? Quite a lot, actually, and nearly all of it in the name of greater consistency between OS X and iOS. That's not to say that Apple is gradually merging the two operating systems – there's no evidence at all that's on the agenda. Nevertheless, several alterations and additions in Yosemite do tie OS X more closely with iOS 8.
Even in the early days of its tenure, Yosemite can already be counted as a success in one way. According to metrics company Net Applications, Yosemite accounted for 36.6% of all instances of OS X, setting a new Mac adoption record in the process. Like OS X 10.9 Mavericks that came before it, Yosemite was made available as a free download, racing out of the traps on October 16. In comparison, Mavericks, which hit the App Store on October 22, 2013, gained a Mac-only user share of 32% after its first month of availability.
Apple has been focusing on fixing Yosemite's bugs now that it's out in the wild. In the first week of December it released a second beta of OS X Yosemite 10.10.2 for developers to download from the Mac App Store. That was followed by a third beta released on December 12, which asked testers to focus on Wi-Fi, Mail and VoiceOver. Should developers find that the release has been successful in fixing those problems, it will go onto general availability and hopefully cure Yosemite's lingering W-Fi issues once and for all.
The most obvious change, visually at least, is the new interface. Yosemite does to the Mac what iOS 7 did to the iPhone and iPad. Its user interface is flatter – though not flat, there are still drop shadows and other nods to the third dimension, it's just that now they exist for a purpose rather than being merely eye candy. No more glassy textures.
There's more translucency in Yosemite than its predecessor, Mavericks. Where once it was limited to the Finder's menu bar, it now pops up in lots of places, including Finder menus and the sidebar of Finder windows. It's been tweaked so that the underlying image is blurred and less distracting than in Mavericks, but we suspect it will still be a love it or hate it feature. If you do hate it, you can 'reduce' it in the Accessibility pane of System Preferences.
Want to get more out of OS X? Check out these OS X Yosemite Tips & Tricks from Mac|Life!
Perhaps the most controversial change in Yosemite's user interface, however, is the switch in font from Lucida Grande to Helvetica Neue – another alignment with iOS. It takes a bit of getting used to, and for some it will never be right, but we found ourselves warming to it over time.
Some of OS X's application icons have changed to resemble their iOS counterparts. iTunes, for example, now has a red icon instead of a blue one.