Its defenitely JUST a trailer in this case, because the movie was THE most fun superhero flick in comedic level since Guardians of Galaxy first one. Besides the visually striking demi-god action scenes, scenes of Hulk and Thor bro-ing out like numbnuts will kill you lol, plus a character called Korg who instantly steals the movie as the comic relief.
I say this as someone who would classify Thor 1 and 2 as average/mediocre light weight in superhero films standards, Thor Ragnarok is a hit, full on entertainment, all the scenes in Planet Hulk /Sakaar was awesome.
Here's a sneak peek of the minor character I meant, I just found out the guy playing/voicing this character is actually the director himself