If you really think it's a surprise, then you haven't understood the significance of Top Gun on pop culture or Cruise's career.
Cruise showed up at the end of the Terminator: Dark Fate panel noting "to me, Top Gun is about competition."
What we know of Cruise and his dedication to movies certainly bears that out.
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Cruise is known to do much of the stunt work for his films himself, so it will be interesting to discover his accomplishment for Top Gun: Maverick when he makes the inevitable late-night rounds promoting the film.
The trailer itself is full of action, utilizing very few words to make its point.
If you are a fan of the original (and you aren't only if you never bothered to watch), then