Though if you haven't gone and opted in for Diablo beta opportunities, I highly encourage everyone to do so. A lot of folks forget to do it at announce and opt in after Beta has started. While it's not really a first come, first serve situation, opting in after Beta started pretty much ensures you aren't getting in for the first wave (since we don't know you're interested).
Beta opt in was changed to be per game last year wasn't it? The account/franchise beta opt in page is gone and now opt ins are added to the game pages individually at some point.
Can look over at WoW : Shadowlands for an example.
My guess is that's why OP thought that is what this was.
Ah, you're right. The process has changed significantly since the last beta I worked on (which was Rise of the Necromancer).
This is, indeed, to sign up for the newsletter and any additional information we might release, including when beta sign-ups go live.
Nevalistis
Accurate. More info about Blizzard Betas in general here.
Though if you haven't gone and opted in for Diablo beta opportunities, I highly encourage everyone to do so. A lot of folks forget to do it at announce and opt in after Beta has started. While it's not really a first come, first serve situation, opting in after Beta started pretty much ensures you aren't getting in for the first wave (since we don't know you're interested).
So it's a good reminder.
Nevalistis
Ah, you're right. The process has changed significantly since the last beta I worked on (which was Rise of the Necromancer).
This is, indeed, to sign up for the newsletter and any additional information we might release, including when beta sign-ups go live.