Upcoming US Madden event is PlayStation-only
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According to this PS3F story, the upcoming American Madden 20th anniversary event will only show the PS3 and PSP versions of the game: no other SKUs will be present.
No reason's been given for the decision to leave the 360 and Wii versions out of the showing, although the "presented by PlayStation 3" line at the top of the invite may have something to do with it.
More through the link.