I'm afraid not. It has been said earlier in statments from M$ that all USB hardware and software will have to be replaces or upgraded to be used with the new USB 2.0 standards.
No, just kidding of course You can bet your life on it that it will be fully compatible with earlier versions. People wouldn't accept it any other way.
Cheers!
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Several security vulnerabilities in Firefox and the Mozilla Suite of Internet software put users of the open-source products at risk of hacker attacks, the Mozilla Foundation is warning.
You can bet your life on it that it will be fully compatible with earlier versions. People wouldn't accept it any other way. 
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