The latest Final Fantasy XIII trailer released at E3 gave a few more facts about the various parties appearing in the game. Below are the translated sentences that appear on the trailer. The trailer can now be viewed via the Official Final Fantasy XIII Japanese website.

Cocoon - A paradise crafted by the inscrutable fal’Cie some thirteen centuries past
Pulse - A vast world stretching out beneath the floating shell of Cocoon, and the source of lurking menace
The summoned - Salvation of the ill-fated l’Cie.
l’Cie - Those marked by the fal’Cie for a greater destiny
The future belongs not to those who wait…