So, there are multiple strands that run in parallel here, it’s not all sequential. But if you think of the MVP (roughly) being the infrastructure of the network, and the MVE being built on top, but encompassing the frontend and complete UX stack.
So if we just wanted MVP and no more then that would really be Maxwell (Fleming + the ability to upgrade it), but MVE is what we think is the minimum required a full launch. We’ll likely hit those requirements ahead of Maxwell, but and keep on powering through iterations and pulling in features, so we’ll have more than the minimum for launch time. But the game plan revolves around getting that MVE locked in, and then plowing on from there through the UX roadmap.
Not to be cheeky, but if you come here to read the weekly dev update, don’t be surprised if you get developers updating you on what they have been working on over the past week. 
There is a tension here: on the one hand we have a demand for all the detail—exactly what needs to be done before the Network will be alive and kicking—and on the other hand there is the desire for us to just get our heads down and not look up until it’s finished and the dream is realised.
Part of striking that balance involves cool-headed decision making on what to work on, in what order, and how deep. So we do need to break things down, coalesce around a shared understanding, and press onward. And that has to happen on a regular basis, correcting course as when required, but most importantly and keeping us all pointing in the same direction, with a single-minded understanding of the job at hand.
So the plan hasn’t really changed, but that’s why we have to keep on looking at these things when they come up, naming them, defining them, and moving on together.