As per the roadmap ..
2017 - Kabylake
2018 - Coffeelake .. Which is kabylake on 14nm ++ with more cores ( just like Skylake to kabylake )
2019 - Cannon lake - ( desktop ) - Coffeelake die shrink on 10nm ..
2020 - Icelake ( the next architecture change )
Don't expect anything big before Icelake launches .. Even then it isn't expected by many tech people to be something like sandybridge ..
The thing is they have been slow , probably because the "Core" is reaching it's limits , it's already way optimized ...
Intel is now focusing on a new different architecture
Intel is reportedly working on a new x86 architecture | CPU & Mainboard | OC3D New
AMD on the other hand , is brand new with it's architecture with way more room for improvement.. and have already said
We’re not going tick-tock,” Papermaster said. “Zen is going to be tock, tock, tock.”
AMD declares Ryzen will be a four-year architecture, details overclocking plans, emphasizes hard launch - ExtremeTec
Competition is going to be neck to neck in the next few years ..