Do I need to get a new sim card for an Iphone 5?

So I saw that the new Iphone 5 has some sort of new sim card tray. I already preordered the phone from Apple. I'm upgrading from the Iphone 3g and I was wondering if the sim cards got smaller. If they are, do I have to go to AT&T myself to go get a new one or does my shipment come with a new sim card installed? Would I be able to transfer all of my contacts, etc?

Yes, the new iPhone 5 uses a new nano-SIM which is much smaller than the previous micro-SIM, or standard SIM

you will need to go to AT&T and get a new nano-SIM for your phone (or call them)

The new iPhone 5 uses the latest nan-Sim card. This card is smaller that the iPhone 3G's card.

If you have ordered a new iPhone through AT&T they should send you a new sim card. If not then you will have to get AT&T to send you a new card.

Yes, you do.

It uses a nano-SIM card, instead of a micro-SIM card. You'll have to buy a nano card