Safari can now see your other devices and what tabs are open on them. So if you want to switch from one device to another, it's a breeze.
Predictive text is now shown on the keyboard, and it's not just single words, but can include phrases. Quite cool!
The camera has a timer of 3s or 10s, this is a feature that should have been there from the start I think.
The task manager (double click the home button) now shows your Favourites and the Recent contacts, by selecting a contact you can either call them or send them a message. Nice shortcut!