new info was released about this guy.

Tetsuya Nomura had a few comments of his own with Dengeki, regarding both FFXIII and FF Versus XIII. Nomura, character designer for FFXIII, shared some details on the mysterious blonde-haired guy who appears at the end of the latest FFXIII trailer. He's a big guy, Nomura revealed, adding that the design specs for the character called for someone big enough to run while carrying two people around. Recently, it was decided that his foot size would be 33 centimeters.
source: IGN