If you have a G Suite Legacy account you have not been able to sign up for the new Gmail. Google only allowed it for free Gmail users and paid G Suite accounts. I just logged into my domain settings for Gmail and I now have the New Gmail Early Adopter Access setting. If you do not have it yet, I am sure you will get it soon.
Jeff -- You received this message because you are subscribed to the Google Groups "Gmail-Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to gmail-users+unsubscr...@googlegroups.com. To post to this group, send email to gmail-users@googlegroups.com. Visit this group at https://groups.google.com/group/gmail-users. For more options, visit https://groups.google.com/d/optout.