It's supposed to be either 10nm or 7nm. Either Golden Cove or Ocean cove is when they move away from the Core architecture, either way current rumours saying Golden Cove is supposedly the next Sandy Bridge. But then i heard similar things about Ocean Cove before so, who knows.
Sunny Cove is the new architecture, replacing Skylake. It does not represent a move away from "Core", which has been the basis of Intel's chips since 2006, although I would think the architectures are unrecognisable by now and the only similarity is the product names. The codename for the chips is still Ice Lake though...it's pretty confusing because until Skylake a generation's core and codename were the same, e.g. Sandy Bridge was based on the Sandy Bridge core. But now, we have Skylake, Kaby Lake, Coffee Lake, Skylake-X, Cascade Lake, Coffee Lake Refresh, etc. all based on the Skylake core.
Anyway, Sunny Cove already exists in mobile Ice Lake chips using 10nm. It's just a matter of when they are suitable (i.e. can clock fast enough) to outperform Coffee Lake Refresh on desktop. Intel hopes 2020.