I feel stupid for asking this, but I couldn't help but notice that my Panasonic P50S60 doesn't appear to have a headphone out anywhere on it (unless I have over looked it). Not really really a problem, just something I noticed. I suppose that most headphone aficionados would be using a dedicated DAC/Receiver anyway.
On a related note it is strange that the P50S60 does not have any way to shut off the built in speakers. According to Panasonic, if someone is using the optical out they should simply turn the speakers down to zero. Once again not really significant but a little strange. Are there people out in the wild who are buying a screen like this and never use external speakers/headphones?