How to get the new iOS 7 for iPhone 4S?

My iPone isn't and I don't want it to be jail broken. My friend has the new update but he has the iPhone 5.

There will be ios 7 on the iphone 4s but the iphone 5 gets it first

Yes. The free way to do this is to download the ios 7 ipsw for your iphone from a website ( there are many out there, make sure you download the right one for the 4s) and basically connect your iphone to itunes and press shift + update on pc ( option + update) on mac. Then select your ios 7 ipsw for the iphone 4 and then just wait till it finishes. Just make sure that your phone is acticated on ios 6 before you update or it will ask you for a registered UDID. And just letting you know, ios 7 on iphone 4 is not very good. It is slow and crashes alot. But you can try it and it and if you don't like just restore to ios 6.

Yes, you can install it on your iPhone 4S now. First, you need to register your device with http://www.instantudid.com/ so it'll activate when you install it. Then download and install the firmware for the 4S.