Over the weekend, Square-Enix and Final Fantasy XIII sponsored the NBA All-Star event in Dallas, Texas. Unsuprisingly, Square took the opportunity to debut the games first commercial in the states.
You may notice the commercial makes no mention of the PS3 version, while showing the game to be available not only on 360, but bundled with the console as well. This is no new trend however. Major multi-platform releases like Grand Theft Auto IV and Modern Warfare 2 have done the same thing (especially in the case of MW2, as it also had a bundle).
Source: Final Fantasy XIII 13 Commercial US HD (YouTube)