I'll spoiler my Avengers 4 takeaways/predictions from that trailer in case someone doesn't want to see it.
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-Theyre pushing hard to look like Tony is gonna die, which reinforces my feeling it will be Cap who dies.
-Hawkeye's family was dusted in the snap.
-Who is the female doing VO around the 30 second mark? Possibly Duke's hidden baddy?
-It may look sexy, but those itty bitty little pistols Black Widow loves so much are completely useless outside of 20-30 feet. C'mon. Arm up, woman!
-SPOILER...1:56 Tony is marching with the group...so he gets back from space (we all knew he wasn't going to be left to starve). This sets up the Bay Armageddon ending..."whatever it takes" as Tony heads for the suicide mission, and Cap knocks him back at last second and goes himself. I have no evidence to support, just my gut, and that the trailers keep pointing towards Tony, so my instinct is to look for the misdirection. Not discounting possibility they both die...as they've now set Tony up as so disturbed by past events that the death of Cap in his place would logically put in a mental ward for the rest of his life.
-Black Widow blonde at meeting of Cap Marvel...so that probably towards beginning of film. They should've never changed her from red, imo. Weakest of nit picks, but yeah.