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Contacts: Simpler, cleaner interface
As with other apps, the Contacts application has skeuomorphic elements removed and now appears simpler and cleaner.
Offline dictation to support government, enterprise
Dictation currently requires users to submit their voice samples and submissions to Apple for data crunching in the cloud. This doesn't sit well with businesses and enterprises, which have to consider information security. Users can now download the database, bypassing the need to submit data to Apple.
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.