It should be noted that developer Zipper Interactive has seemingly taken a cue from Guerilla (with its infamous E3 2005 trailer for Killzone 2) and decided to saunter down the entirely pre-rendered CGI route with this trailer. We're fairly confident that the visual style will carry over to the final product, but everything else? The label reads: "Take with one very large grain of salt."
Oh, and 256-player online? We don't doubt it will work ... we just doubt our brains' ability to process 255 racial slurs and/or homophobic remarks simulatenously.