Apple says that Safari represents two thirds of all mobile web traffic, so it wants to make the experience even better with iCloud Tabs (syncing tabs across Macs and iOS devices) and offline reading lists (which caches stories). You can also now upload photos from within the browser for those sites that support it.
Another key feature is Smart app banners, which will display a banner advertising your mobile app right at the top of the screen. It's a great tool for discovery, and if you have the app installed already it will let you pick up in the app right where you left off on the web (such as a restaurant review in Yelp). Last but not least is better landscape support in the browser.