The new should 1160 or 2060 will be faster then the 1070 and the 1170 or 2070 will be = to the titan/1080ti and the 1180 or 2080 will be 25-30% faster than the 1080ti. We wont be getting major speed increases like they suggest. The chips are still 16nm just with increased transistor density & IPC in the same size gate.
I think that's the 14nm+ Vega in the roadmap slide from AMD. Probably will be higher clocks, and hopefully some power draw improvements as well.
Same thing happened to me, stepped up from my 1070 FTW to a 1080 Ti FE because my window was over before the FTW3 came out.