GamersNexus has an interesting article on how Star Citizen will benefit from DirectX 12 and Mantle.
"DirectX 12, as we show in our draw call benchmark
, has the potential to massively benefit lower-end CPUs".
"Both Dx12 and Vulkan, formerly “OpenGL Next,” benefit games of large-scale nature by improving lower-end hardware performance."
Especially when you take the benchmarks mentioned above into account.http://www.gamersnexus.net/guides/1885-dx12-v-mantle-v-dx11-benchmark
That sounds to me that this will make Star Citizen playable on significantly more machines than currently.
There is also a vblog interview with Chris Roberts on that topic.