Samsung OLED TV
No doubt about it, the 55-inch OLED TVs from Samsung (shown here) and LG stole the show for me. (Yes, there were a lot of 4K flat panels as well, but without 4K content, they are not all that important except for passive-glasses 3D.) This is the first new TV technology to become a real commercial product in many years, and it beats LCD and plasma in every way. Both manufacturers claim to have solved OLED's longevity problem, but only time will tell if they actually have.
No pricing was announcednor was a model number in Samsung's casebut I've heard rumors from $5000 to $10,000. If it's closer to $5000, that will be a home run right out of the gate; if it's more like $10,000, these TVs will be a niche product until the next generation brings the price down.