Will iOS 7 be upgraded on all apple technology?

I want to know if iOS 7 will be upgraded onto the iPhone 3, 3s, 4, 4s etc. Also will it be on apple computers, and macs?

IOS 7 will not be available on the iPhone 3G or 3GS and some older macs, though I'm not sure if it will be available on the iPhone 4.It will definitely be available on the iPhone 4S and later, the iPad 2 and later, and the iPad mini.

IOS 7 Will only be for the iPhone 4, 4s, 5 and the new iPhone 5S and 5C. And some ipads & only the iPod touch 5th generation.

According to Apple's website, iOS 7 (Apple's MOBILE OS [it won't work on Apple Mac's]) will work on:

iPhone 4 and newer
iPod Touch 5
iPad 2 and newer

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