I just flew back from IST to LAX on Nov 22, 2011. Looking at my cabin pictures, I see the plug that you may be referring to is round, about 1/4" in diameter. I did not actually use the plug so I can't tell if you power was live at the receptacle. I can say with certainty that an iPhone or equivalent device can be plugged in to another outlet just above the round plug receptacle to keep that device battery charged. And yet another plug receptacle seemed to be for plugging in an internet cable but I did not try that either, and I recall that the AVOD screen indicated that that particular capability was coming in the future.