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Lock screen notification previews
If you step away from your OS X machine for a few moments and lock your device, you will return with a stream of notifications on your lock screen so you can return to them immediately or later. It doesn't disclose the contents of your updates, but gives you an at-a-glance view of what happened while you were away from your screen.
Tabbed Finder browsing
Finder now includes tabbed browsing, allowing to switch between various folders and views. Tabs can be shuffled around in order by clicking and dragging to rearrange their order.
Tagging in Finder
Files can be tagged by importance or category, allowing users to jump back instantly to one view of documents that relate to specific events or schedules.