the dark clouds you see that are kind of pointing down are the tendrils of the Tyranid hive fleet. (Ack... ninja'd)
IC: I know there are companies that specialise in doing short CGI clips that just look down right sexy, but it never hurts to dream right? sure it might not be as fantastic, but technology has come a long way over the past few years... i mean look at the Blood Quest clips that were released.