There are a few gameplay differences between D2:ED and DKS (flying fortresses redesigned, most anti-dragon shields removed, changes to loot and enemy placement, etc). I have not played the PC version of D2:ED or DKS, but I'm pretty sure the main difference between the PC and Xbox versions are the interface, controls and camera; the actual game content is the same.
An Xbox version of DKS will be released in North America (along with a physical PC release in the US), but we are still waiting on an official announcement from the publisher, and last we heard Larian still working on the finishing touches.
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