Basically it's to see if I've understood it correctly. With this plan, they want to leave the game ready for a migration to 2.2. That is why they are going to change and modify functional things in the game (64bits and others...), but as for the graphics of the engine, it will be by the time they have everything ready, right?
Merged.
I think that visually there will be no changes until they improve the game in general (performance, loading times and other "functional" problems that the game has).