The gameplay shots shown before were nothing but bullshots so that has nothing to do with 360. The NA and EU versions of FFXIII will not have Japanese audio however it's just a few otaku's which will suffer and that is not a big deal. The voice acting for the English versions looks very good and if you want to play the game in Japanese get the Japanese version.
Simple as that, the 360 is not hindering the PS3 version at all. People are acting as though FFXIII will have English SO4 quality voice overs.