Has binaural audio been considered?

Yeah, so we have internally tried out a few different HRTFs. We haven't settled on exactly what we want for our game yet. I think what we really want to do is get back into the new studio and get some solid work done on how the game sounds in surround. And I think that is the basis of coming up with a decent binaural/HRTF solution: knowing that what it's trying to express is good in the first place. So yeah, I think we've got some work to do in that department, but it's all part of our research and it is ongoing.