Supposed to be Q4 2017 but no official date. As for 40% faster, depends how you measure is. It looks like single core speed will be up very slightly but multi core/threads will be up 50%. The i5 & i'7 will now have 6 cores instead of 4. The i3 range are going up to 4 cores from 2 cores with hyperthreading. The potential gains in multithreaded applications look significant.