These are all done (SOLID is ongoing). The last big thing we need to finalise is network upgrades. These are likely to start with
a forceful mechanism and evolve to fully network aware upgrades. That does not stop the launch, but makes it easier I feel.
These are not big structural changes, at least not from our perspective. It is cleaning up what we have and hopefully making that clear, which we have not made clear enough so far, as the discussion show.
Hope that answers your questions?