Safari is going to receive quite a few updates in iOS 7 including an updated tab view, new gestures, and more.
The new navigation menu in Safari has received an updated design just like the rest of the core apps. One of the biggest changes is how tabs and other features are displayed. Each tab will be shown in a tilted stack so you can see exactly what you're looking at. To get rid of a tab, just swipe it sideways.
To see even more features of iOS 7 as Apple announces them, check out our WWDC live coverage!