Hi Meg,
The new Maintainers team includes a couple developers focused on AtoM as well. We are still waiting for them to finalize and publicize their upcoming roadmap, but I believe the current working plan is for the next major release (2.8) to address both the Ubuntu and PHP versions. There will very likely be a patch release before that, but we typically do not add new features, schema migrations, or major dependency upgrades in point releases - instead, expect a number of bug fixes etc.
I don't yet have a timeline for these release plans - hopefully we'll be able to share more soon!
Regards,