The page in the release notes above the one you linked explicitly states what is required to use it:
Who: DevOps Center is available to all customers and can be enabled from the Setup menu. To use DevOps Center, add team members as users in the org in which DevOps Center is installed. Users also require a GitHub account and access to their team’s GitHub repository.
Github is all that's supported as of Winter '23.
Is it expected to show up with the next release?
Even if there was a published expected release (which there isn't at this point), with safe harbor, there's no guarantee. What we know, as you noted in some demos you saw, is the plan/roadmap is to support more than just Github.