|This is the rulebook. Not the Teaser Trailer.|
There's also the fact I don't intend on getting both other's and my own hopes up about the changes being forecast: I'm hopefully optimistic that I'll still be playing it in 12 months time despite all of the lelrandom that is supposed to be introduced.
Here's another cryptic teaser trailer from GW via Heresy-Online. It looks like a Navigator in the video. Probably some guy cranky that he can no longer rely on getting the good powers from his codex but is now selecting them at random.