The transition: looks like levels were blown out and then brought to black, the colors were mapped to blue and then red, I saw a bit of texture in there- may come from the image used or grain or a separate image, a bit of blur and a lens flare- but that's just my guess. There's no real formula, play around with the above to get that transition.
The light- one way to do a laser pointing at the camera is to have a Knoll Lens Flare preset- Red Laser attached to a light in AE, with Trapcode Lux on top- to see the beam.
Tudor "Ted" Jelescu
Senior Compositor/VFX Artist
To get a closer look at the transition, I would suggest downloading the trailer from iTunes or apple.com/trailers, then viewing it frame by frame. You'll probably find that it's just 3-4 frames of grungy texture. Whack a swooshy sound over it and you're done.