There were too many changes in DKS (redesigned flying fortresses, changes to enemy placement and loot, etc) to maintain save compatibility. Lar mentioned recently the possibility of creating a tool to import D2:ED saves and export them to the FoV section of DKS, but it would have to wait until the FoV to DKS conversion patch is done. If such a utility does get released, I don't know if an Xbox version would be feasible (though in theory it could get added to DKS before the North American release, or later as a patch or add-on).
