Mac OS X
Although, Windows teaches us that laggardness is relative.
Also, Wi-Fi and screen sharing improvements.
Apparently, the U.S. government can’t get past Candy Crush level 147.
iOS and OS X developers will be able to see issues much faster when they arise.
Upgrading from a stable Mavericks installation to iffy Yosemite still seems like a dice-roll at best.
Some Macs have already been fixed by Apple.
Apple recommends the update for all OS X Yosemite, Mavericks and Mountain Lion users.
With merging OS X and iOS, it’s a matter of “when,” not “if.”
The first serious compromise of iOS security on non-jailbroken devices.
Is Apple spreading its OS development resources too thinly?
Not everyone is seeing it yet, though.
Honestly, I kind of wish this had happened sooner.