Final Fantasy XIII will see simultaneous release on the Xbox 360 and the PS3 in US
According to Siliconera, Final Fantasy XIII's 360 port has not been announced for release in Asia. The team is currently focused on finishing the Japanese PS3 version of Final Fantasy XIII. "The priority is to bring it to the PS3 first."
The content will be the same, but the media or quantity of media may be different due to the size of the Blu-Ray disc
For the US the Xbox 360 version and PS3 version will be released at the same time. However, the release date for Europe may not be the same as the USA.
Final Fantasy XIII for the Xbox 360 is NOT announced for Japan.
For now there are no plans for motion control in Final Fantasy XIII.