No way it'll be 10% better than skylake when it's a skylake refresh. We've hardly seen a 3% increase each gen from hw to bw and bw to sl and that's ipc not in gaming. Ib still holds it's own in gaming so you are likely to see no difference if it is oced.
Dx12 support for ib is about the igpu. If you have a dgpu then it doesn't matter and since this is an i7 wielding gaming pc, I'm pretty sure they do.