Actually, the patch should be released on Xbox, as well (especially since non-US releases didn't get the 1.03 update). The D2:ED patch and FoV were intended to be released separately from the start (though of course FoV would also include the changes in the patch), so not being able to release FoV as DLC doesn't mean the patch would have to be canceled.
I hope they do. They promised the 1.03 patch and we never received it. And since FOV will be bundle with ED it looks less likely. But we'll see.