Right.
To clarify what Drakino just said: Whether or not the Empeg will support this new "MP3 pro" format is a moot point. There's no encoders for it out yet, so you wouldn't be able to create these kinds of files even if you wanted to.
So if you're encoding your collection now, your choice is between WMA and regular MP3, what encoder you want to use, and what bit rate you want to encode at.
(Of course, WMA is not yet supported on the Empeg, but it will be when the 1.10 software comes out. If you want to listen to your tunes on the Empeg now, then your only choice is regular MP3.)
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Tony Fabris