There is a limit imposed by Microsoft of what is considered "patch" and what is considered "extra content". I believe you are only allowed to patch the main executable(s) not add anything else. Beyond that it is extra content (just see Burnout Paradise on 360) and not auto-patching anymore, the user has to download it. And also, the user has to pay for it. Microsoft is not allowing free additional content (specially if it is big) unless it is also available for free in the concorrent plataform (PS3). That is an written rule, but it is a fact (again, see the free Burnout content and the mess that was Valve's Orange Box and Left4Dead).
Back the the game, I really want to play it on my 360. I may wait for the US release if it is sure that it will come out this year. Otherwise I may import the German version. And I believe the 360 version will already be in pair with the patched PC version.
