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why would it need to?

if your itunes library in windows is already organised into the single itunes music folder in the "my music" directory, you can just drag it into OS X's music folder and it will work just fine.
 
my mistake :)

Streaming iTunes Content
Enjoy your iTunes library — and more. Front Row lets you play iTunes content located on other Macs and PCs in your house.

well that means you can connect to shared itunes libraries on macs or pcs and stream itunes content. youve been able to do this for a while in itunes but now you can do it through front row like on an apple tv.
 
This isn't a new feature. Front Row already does it.

OS X Leopard Features = OS X Leopard Features - 1
 
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