Just wondering what kind of cable I need to output audio and video using the new AV jack on the RPi model B+. I'm assuming it would look like a headphone cord but split to RCA or similar?
It would likely be a 4-pole RCA cable, similar to this one -
However you will need to check pinouts on the cable to make sure it matches with what the Pi is outputting.
I found this blog post - http://www.raspberrypi-spy.co.uk/2014/07/raspberry-pi-model-b-3-5mm-audiovideo-jack/ - that details it