"And then the reveal: Mac OS X — sorry, OS X — is going on an iOS-esque one-major-update-per-year development schedule. This year’s update is scheduled for release in the summer, and is ready now for a developer preview release. Its name is Mountain Lion."
Yearly updates? Most exciting nugget of news in the post, IMO.
The only problem is that iOS updates are free, while OS X updates are not. With one update per year, they run the risk of version fragmentation if users have to pay to keep up with the upgrade cycle.