Apple has posted a nice 10-slide presentation on the new features in Mavericks called What's New in OS X Mavericks. Whether you've already downloaded it or are just thinking about it, it's a vey good, though broad, overview of the newest version of OS X. It covers, iBooks, Maps, Calendar, Safari, Tags, multiple displays, iCloud Keychain, Notifications, Finder Tabs, and then a wrap up page. Each slide offers basic information on the feature with some animated images that demonstrate what's being described. You may also want to check out John Martellaro's piece, 5 Mavericks Must Have Features.
Check It Out: What’s New in Mavericks? Apple Shows Us in 10 Slides