Here's a massive screenshot gallery that shows the new design and features of iOS 7.
Control Center, Multitasking, Music:
Phone, Contacts, FaceTime:
Mail:
Messages:
Weather:
Maps, Calendar:
Videos, Game Center:
Notes, Reminders, Passbook:
Newsstand, iTunes:
Compass, Calculator, Clock:
Notification Center:
Camera:
Photos:
AirDrop:
Safari:
iTunes Radio:
Siri:
App Store:
Find My iPhone:
iOS in the Car:
Control Center, Multitasking, Music:
Phone, Contacts, FaceTime:
Mail:
Messages:
Weather:
Maps, Calendar:
Videos, Game Center:
Notes, Reminders, Passbook:
Newsstand, iTunes:
Compass, Calculator, Clock:
Notification Center:
Camera:
Photos:
AirDrop:
Safari:
iTunes Radio:
Siri:
App Store:
Find My iPhone:
iOS in the Car: