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Calendar: No more skeuomorphism!
One of the criticisms of the Mac software was this faux-realistic design aesthetic known as skeuomorphism. In the latest release of OS X Mavericks, these designs and virtual prints have been ripped out and replaced with a 'professional'-looking updated user interface.
Calendar: Multiple week, month, year views
Aside from the visual design, one of the new "late to the game" features is a week and month view to give you a greater view over what's coming up when and where.
Contacts: Simpler, cleaner interface
As with other apps, the Contacts application has skeuomorphic elements removed and now appears simpler and cleaner.