MacMini and USB3 (USB2 Obsolete?)

Just purchased a new 2gHZ MacMini
I have been reading that USB3 will soon be here to replace USB2
Since the current Macmini has USB2 ports will that make them obsolete when USB3 arrives? I presume the newest MacMini models when they are released will have USB3 ports.

Ahh...not too worry.... I just found this:
Regarding to
but my understanding is that USB3 is optical so is completely different from the 2.0 specification.
With just a quick search I was able to find this:
Backwards-Compatibility: USB 3.0 is designed to be backwards-compatible with USB 2.0 and USB 1.1.
http://www.pcworld.com/article/id,137551/article.html
I think we won't have to worry about compatibility with older devices - I guess it'll be like USB 1.1 vs 2.0.

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