Personally, as someone who's played Destiny from launch to present (albeit sometimes somewhat reluctantly, my friends are far more enamoured of it than I am), I pretty much thought the reveal trailer was shite. Overall it didn't tell us anything that wasn't long rumoured, it certainly didn't tell us anything about how Destiny 2 will be compared to Destiny 1 -- beyond that "Hey, here's a reason nothing whatsoever will carry over from the first game" -- and it gives me every reason to think Bungie is going to continue to make the mistake of Telling, not showing, as their primary story mode -- as much as the game has a story or any meaningful lore.
Beyond that, the tonal shifts just weren't very clever, IMHO. I'm not really even sure who the trailer was aimed at, beyond hardcore fans who were going to nerdgasm no matter what.
I dunno, maybe it's just me. I long ago grew weary of both Nathan Fillion and Cayde 6. The character had his moments -- most of which, IMHO, was when paired with Eris -- but now it just seems like they lean on using him as a way to engage the playerbase because he's the only character they get a positive response from.
Hey, Bungie, maybe that's because he and Eris are the only characters that, well, have any discernable character whatsoever?
Meh. I'll no-doubt end up getting Destiny 2, thanks to my aforementioned Destiny-obsessed friends, and in many ways Destiny 1 is an amazing games. It's just that in just as many ways it's a pretty terrible one and so far I'm not seeing anything to convinced me Bungie knows how to, or is even interested in, fixing that.