Currently Apple has only released iOS 7 beta download for iPhone only. iPad and iPod touch links will be added later.
If you're not an iOS Dev, you'll need to wait until fall to download iOS 7 final release. To see a full list of new features on iOS 7, feel free to check the Apple site at www.apple.com/ios/ios7/.
Update: It appears Apple's iOS Dev Center is currently down, likely due to all the traffic from everyone trying to download iOS 7. If it doesn't load for you, you'll need to try later. I'll update this post once it's back up.
Update #2: iOS Dev Center is back up, you can now download iOS 7 beta!