https://wccftech.com/amd-zen-3-ryzen-epyc-cpus-and-rdna-2-radeon-rx-gpus-2020-launch/

AMD has updated their next-generation CPU and GPU roadmaps which confirm that the Zen 3 and RDNA 2 would be shipping to customers in 2020. The new products would utilize TSMC’s bleeding-edge 7nm+ process node, delivering higher performance and much better efficiency than existing products.

While AMD isn’t yet done with their 7nm based Zen 2 or RDNA (1) GPUs, their roadmap confirms that we will get a taste of new designs in 2020. AMD’s Zen 2 chip architecture would be replaced with the Zen 3 core while the 1st Generation RDNA architecture would be replaced with the 2nd Generation RDNA architecture.