What features will i get with ios 7 on my iphone 4?

I know because it's not the S or iPhone 5 I don't get everything. But what will I get exactly? Is it worth upgrading? Will I lose battery life wih iOS 7?

IOS 7 introduces great new features like Control Center, AirDrop for iOS and smarter multitasking. It also makes the things you do every day even easier, faster and more enjoyable. And while many of the apps look different, the way you do things feels perfectly familiar.

It is worth upgrading and it takes up 1.1GB of memory.

Here is a video of all the new features.http://www.apple.com/ca/ios/whats-new/