So I was curious about the platform credits after Peff's post about it changing from 'For Playstation 3 Only Worldwide' to just 'For Playstation 3' so I went back through the trailers to see how it played out:
In the 2006 Teaser Trailer, it read: 'For Playstation 3'
In the 2007 Dengeki Special Edition Trailer, it read: 'For Playstation 3'
In the 2008 DKS3713 Trailer, it read: 'For Playstation 3 Only Worldwide'
In the 2009 Advent Children Complete Trailer, it read: 'For Playstation 3 Only Worldwide'
In the 2011 Reveal Trailer, it read: 'For Playstation 3'
Note: I didn't include the 2010 Fabula Nova Crystallis Trailer because the credits only displayed the date for the January 2011 conference.
I'm not trying to derive any meaning out of this, I just thought it was interesting so I made a list.