We have been in talks with a major device OEM to have their next-generation devices provide official support for GrapheneOS by meeting our requirements. This current initiative has been happening for the past few months now.
Providing this goes through, this should be a year or two from now. We haven't said who we are working with yet though. You just have to give our word that they're well-known.
Having a device other than Pixels has always been a goal, but not having a device that does less than them.