I was there on 6/7 and the seating was in rows of chairs flat on the floor. I'd suggest getting in line for the door as early as you can (take turns going out for food and drinks) and then try to snag either a front seat or one on the aisle. Not sure the first 2 rows will be taken up by Disney suits and the families of the performers as was apparently the case with the first show. I couldn't see that, I was way up in the side section, but there was a report written about it.
The chairs had backs, which was an advantage over the bench seats.
Other thing you want to watch out for (no idea if it was changed for 6/14) is that if you want the lion chow snack during the show, better grab it while they had it out (one per person please!). They had the containers sitting out and people were grabbing 3 or 4 of them apiece, which meant that ultimately there were not enough of them to go around.