As Zorin 15.x is an LTS until 2023, I would expect any useful elements from 20.04 would find their way through updates in the normal way, via rigorous testing by Team Zorin. But thinking about it someone did post on here that LTS's are every 2 years so Zorin may come out with 16? If they do it is normally a couple to three months after the main distro release time as an unstable release would lead to people leaving Zorin.