If you were getting only 3 FPS with that system then something was seriously wrong. On a Phenom II X6 (which means similar IPC to the Jaguar APU) and at lower settings, a constant 30 FPS is attainable when the GPU is not the limit, and that’s with the current DirectX 11 version. I can’t imagine that a somewhat slower core clock but with two more cores would result in a tenfold decrease.
They said in a recent Q&A that the optimisations will benefit slower systems the most, so I wouldn’t rule out the chance of an Xbox One release yet. I don’t think it’s going to look too pretty on that system, but on the Xbox One X it could be a passable experience. I’m more worried about the loading times due to the HDD, but then they said that this is something they’re improving too.
Overall, my system’s configuration is very similar to the Xbox One. If somehow it is compatible with the DirectX 12 version, I’ll let you know how it goes!