I really cannot speak to that honestly, UE4 4.8 was just released today I haven't not had the chance to use temporal re-projection. So It remains to be seen. My issue with VR is that the current CG pipelines and the efficiency built into them tend to breakdown with VR. I always see this demo brought up as a triumph for VR fidelity but I have seen it many times Including on a prototype build of UE4.8 at GDC and it really didn't run well. Like I have said in the previous thread there needs to be fundamental shift in the way assets are created for VR this has not happened and until then many games are going to be hacked together like this demo or will be smaller in scope and experience. I have developed and published UE4 oculus experiences and I am not discounting we have come a long way since UE4 4.4.
That sounds reasonable.