Will I be able to factory unlock iPhone 5S?

I'm on AT&T - I currently have my iPhone 4S factory unlocked (did it myself for a few dollars) for when i travel abroad. Will I be able to do this on the iPhone 5S?

No. You can't "factory unlock" any phone as the term refers to phones manufactured from new as unlocked examples. Phones unlocked afterwards are simply called "unlocked" and may still have some differences to factory unlocked examples.

And no, you won't be able to unlock a 5c yourself until someone has worked out how to do so and makes the information public; there are never any guarantees that will happen as phone manufacturers are always trying to find new ways of making their phones impossible to unlock unofficially.

There will be a way to factory unlock it, and when you factory unlock iphones there's no difference between factory unlocked when bought and factory unlocked after.

they both work the same way

keep an eye on

www.tronicscity.com
they have unlocked iphone for me before and specialize in unlocks.

I think you can but can't be sure as it's not released yet.