The one report I've read indicated that the new movie would NOT be showing when the ride reopens.
I don't know if that is a confirmed fact or not.
Here's where I find things get very strange
DL has announced that the new Soarin Over the World movie will debut at DCA after the Holidays are over.
They will split time each week, a few days will be Over CA and a few days will be Over the World
So the movie is ready, or near enough to be ready to show at DCA, where they already have the new projection system
That has to mean there is no logical reason NOT to debut the new movie at Epcot when the ride reopens.
So I hope what I read is wrong
ETA - Report I read was here
http://www.orlandoparksnews.com/2015/10/rumor-soarin-closing-for-lengthy.html?m=1