So the ps3 allowed players to set what kind of audio they wanted to output and which output to send it though. I have a TB headset that will only work via optical Dolby Digital 5.1. Will I be able to use it since the ps4 does have an optical out?
depends on how the game is developed, but in all likelihood, yes
Cognitive Dissonance - The ability to understand multiple viewpoints even if they conflict with one another - and still use critical thinking, logical thought, and common sense to come to the realization that only ONE is the correct one and the others are wrong.
Since it's been confirmed by Astro and Turtle Beach that optical headphones will work for audio only for now, the PS4 does support Dolby 5.1. You wouldn't be able to get Dolby Headphone any other way which is the technology most of these surround sound headphones use.