I think it is a safe bet that ML is working on a replacement for the CTX 3030 (and likely an addition to the Nox line) but I kind of doubt either will be released in 2022.
Garrett has all but said they're working on a more premium smf detector. I'd be surprised if it is released in 2022.
Nokta-Makro has said they are working on a pulse machine. I won't be surprised if it is released in 2022, but don't really expect it. I do expect NM will release a 9X5 coil for the Legend sometime in 2022. I also think NM will release a new blue tooth pinpointer sometime in 2022.
Some rumors claim First Texas is working on a smf detector, but that seems unlikely given comments made by one of their engineers.
I'd be really surprised if XP releases a new machine in the next couple years. I do think XP will release additional coils for the Deus II, but probably not in 2022.
I think the big change, outside of the Legend and Deus II, will be a bunch of really good used machines (at decent prices) listed for sale in 2022. I think much of that will be driven by people wanting to try the Legend and/or Deus II, but there will also be people selling machines so they can buy the used Equinoxes, Deus, Anfibios, etc... that are being sold or traded in for a Legend and/or Deus II. I also think the Equinox will continue to be a very good selling machine.