An interesting engineering element on the reference board includes a set of 4-pin leads for what we are told is for an audio jack -- or at least the leads for an audio jack. If it is indeed an input for audio signals (appears to be SPDIF), then for upcoming graphics cards that boast HDMI connectivity, this would definitely make sense. As for the current reference design, there is no such connector featured and we will have to wait for final designs to see what happens.