Wrote a pimp-ass article for it on Examiner.com. He's a small excerpt:
"Birth By Sleep takes place about ten years prior to the original events of Kingdom Hearts,revolving around the Keyblade masters before Sora and Riku. One in particular, Master Xehanort (the old man) as well as his apprentice (Vanitas), disappeared. Terra, Aqua and Ventus, three apprentices and the knights in the , were ordered to find him."
For the rest of the article (and the bad-ass video trailer), click here.