You should probably not watch them then. I suspect they’ll make a bajillion dollars and most people will leave happy.
That said, I continue to be unimpressed by Thanos who is apparently someone that comic fans gasp at in awe, but I just see a goofy looking pink/purple/blue guy with a molded clay chin.
To be honest, Thanos in this trailer looks sort of like Hellboy to me. That look worked for a dark comedy, but it makes it hard to take him seriously as a villain.
I’m assuming whatever the name is for Avengers 4, it will somehow spoil Infinity War, since they’re keeping it under wraps. It will probably be revealed in the credits.