I’ve long believed that Mueller would be allowed to finish the work necessary for Congress to take this thing the final mile, and I see nothing that would suggest I should change my mind now. Plus, Marcy Wheeler has reason to believe the same, so I’m in the very best of company!
I’m fairly certain the concerns about Barr coming in and forcing Mueller to finish this are misplaced. I say that, in part, because Mueller seemed to be preparing for this timing. I say it, too, because Barr is too close to Mueller to do that to him.
That says that Mueller is choosing this timing (and choosing not to wait for the appeals to be done). Whatever reason dictates this timing, by doing it in this window, Mueller can ensure the legitimacy of what happens, both legally (because Barr will be in place) and politically (because it will be clear Rosenstein presided over it).
So whatever comes next week, people on both sides should accept that it is the outcome of the investigation that Mueller deemed appropriate.