From what Linus said in his video, the pro HD6xx series was included. And he also said further on that all headphones were included in the deal. This is just one source of course. The future will tell what happens. I doubt they will drop a lot of the classics very soon, as the buyer has also been allowed to use the Sennheiser name, so I think that Sennheiser may still have something to say about it in the first year(s) of the deal.
We'll have to see if Sonova decides to remain in the audiophile market, or if they decide to go for the more lucrative popular market (wireless BT for portable use, 'hip' headphones in multiple colours and such toys, etc). Still, I wouldn't wait til 2022 if you want something like an HD600 or 650.
I do wonder if Sonova will keep the manufacturing in Ireland (maybe they can also use that for their hearing aids) or if they will move it all to China, like AKG did.
Everything went to this for a long time, the main thing is that the headphones would continue to be produced. Especially the classic ones, I really like them. I often read about business ethics and use
https://studymoose.com/free-essays/business-ethics for this. When I see such high-profile statements, it is always interesting for me to delve into the process. It's really interesting how everything happens and what it will lead to.