I don’t think it’s a simple either/or answer. Yes, it made me more excited to see the movie too, which I’m sure is why they put it in there. But I would have enjoyed it even more if I didn’t know about it ahead of time.
If it had been a complete surprise that showed up in the middle of the movie?? I would have LOST MY SHIT. It would have gone down as one of the greatest movie reveals of all time! But they want to get asses in the seats, so they’re going to reveal as much of the movie as they can get away with.
(And by the way, it’s the same thing with Spider-Man in Civil War. THAT’S something they could have kept secret more easily, and people would have lost their damn minds! I don’t think “It will get more people in the theaters!” is a valid excuse for ruining major surprises in a movie.)