Star Citizen WILL utilize 8 cores. CryEngine is already using around 5 or 6 right now according to Chris Roberts and more will be added. He also announced at PAX that the game will be using 64bit floating point precision compared 32bit that I think, every other game uses. 32bit floating point precision is the reason most FPS games like Battlefield 4 have to have maps of a certain size limit. Once you get to a certain point the accuracy of things is just off. 64bit will allow them to push the boundaries of accuracy of the system in dogfighting scenarios.
From what I've read so far, that 64bit floating point accuracy is mostly processor based.