I watched this video (link above) yesterday and it confirmed some things that I was thinking:
1) I know less than nothing about video
2) Sony makes great sensors
3) Full frame sensors have some advantages
4) Sony's contrast detect autofocus is extremely poor at tracking
5) Samsung is going to be a much bigger threat for Sony than Olympus, Panasonic, Fuji, Canon or Nikon.
My evaluation of Sony's future place in the camera marketplace will depend on how they address the auto-focus on its cameras. Basically, if they can match the kind of performance I saw from that Samsung camera in the video then there shouldn't be any reason Sony can't produce a world class camera. If not, then they'll be in trouble.