We'll have to wait for the architecture deep dives, but so far it looks, like most GPUs, like an evolution of the previous rather than a completely ground up design. But that's normal, you don't throw away previous R&D until you have something better.
That said, it's definitely on a new process, and it's definitely changed with respect to pipelines and capabilities/power of tensor cores etc. so no, I wouldn't say it's like any kind of variant of a 20XX series.