To sum it up, nope. From what my peeps have told me from the Epcot CM preview, it's only 12 people per boat (I think that's reduced from before) with a capability of running 9 or 10 boats at once. As for efficiency....lolz. It's still only grouping one boat at a time for two at 28 second dispatch interval.
As for estops....let me put it to you this way: many of my friends were able to go yesterday. Only a handful were actually able to ride it. When people say that it's not a question of whether it will be open, but for how long/Epcot brass giving out contingency plans for today...it's going to be a VERY interesting day indeed.