I'm unsure of the current monorail hours during Extra Magic Hours. Will the TTC monorail still be running after EMH, or does that still shut down one hour after the park closes?
I don't know, either, but if it is shut down when you want to leave, there will be signs and buses to get you back to the Poly. So no need to worry - just know that you will have to look for signs when you exit EPCOT.