Apple tends to be several months behind when it comes to putting in intel chips so the 13/14” refresh will be ice lake with comet lake for the 16” most likely if they refresh it. Tiger Lake looks promising but from the ARM rumours Ice/Comet Lake could be the last MacBooks with Intel chips as if Apple announces the ARM transition at WWDC this year it may only be 18 months before most of the lineup maybe excluding Mac Pro is converted over to ARM