Intel is weeks away from releasing yet another CPU family because they're definitely not scared of AMD's continued threat by Ryzen and Ryzen Threadripper, with Coffee Lake-S led by the flagship Core i7-8700K which seems to overclock incredibly well.
Intel's new Core i7-8700K has been busted hitting 4.8GHz on all CPU cores (6C/12T) on air cooling, which is great to hear. But if you want to get past the 5GHz ceiling, you're going to need better cooling - and you'll need to delid the processor as well.
All in all, the Core i7-8700K hitting 4.8GHz on ALL 6C/12T threads is pretty damn good. It'll be interesting to see how much more it can be pushed, and whether 5GHz is something that will require watercooling, or more.