I got mine yesterday from Fry's for the same price too and it was the last set in that store. But i wonder why they slashed the price so low for a 2012 model? I couldn't find any store even on the internet which is selling that model at that low prices. Even the LW5600 costs more.
I connected the optical audio out from the TV to my AV receiver and played mpeg2 files with dolby 5.1 tracks using the TV's video player. I confirmed that the receiver is getting dolby 5.1 from the TV.