I don’t think there’s anything new to share here at this point.
The built-in system for managing the existing tabs is itself something that could use some improvement. There may be a way to consider how to make it possible to add custom pages as part of that feature while thinking about how to make it more intuitive to define those pages themselves, but there’s been plenty other things higher on our list related to making it easier to set up a new site, so that hasn’t bubbled to the top of our list yet.