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Notification center previews
Notifications can now be accepted and replied to, or dismissed on the fly as and when they come in. More applications are supported, including websites, which can now let you know if you won an auction item or a change was made to your online order.
Reply-to in notification toasts
You can even reply to messages and emails from the sidebar by hitting the quick-"Reply" button on notifications, or close them for later reading.
Renamed options: Internet Accounts
There are also some minor changes and tweaks to the operating system. "Mail, Contacts & Calendars" has been renamed to "Internet Accounts." It is now designed to bring together your contacts, mail, events, and other data from your various accounts, such as Facebook and Twitter, among others, and compliment existing iCloud and OS X data.