I don't think Apple even advertised this ability. But it sure is useful. I haven't seen any refreshing of tabs yet but I always have like 10 pages open at a time I love my tabs. It's two things I noticed I could do.
Safari tab peeking
What you do is, in Safari when you've got multiple tabs, just hold down on any tab, you can peek at more of the page.
Go into Multitasking mode without double pressing the home button
Deep press into the side of the screen swipe from the left.
This one is actually useful in quiet settings. Don't tell anybody this, but sometimes I don't want to make a button clicking noise while I'm in the bathroom cause I don't want people to think I'm writing a bunch of emails in the stall. So I use this for that. Lol