Hmm. It looks like it's a fun campy movie just like the originals. I'm glad it's a sequal in timing, but they're obviously re-using many of the jokes and gags from the first one, with very minor differences. Being slimed, the hearse, "I'm sure the ghost is nice...". The callbacks to other movies (head turning, "the power of pain compels you") are new enough, but the mixture still seems to be heavily remake territory rather than sequel territory.
That said, a trailer is always aimed at an audience, and this one was aimed at those who loved the original and are worried about whether the film will capture the campy feel of the originals. It does. Perhaps to excess, but I think it shows that the film is going to be right in the same vein as the originals.
As far as the portrayal of the black character, they've got three wicked smart women, and they're subverting the hot secretary role by making the object male. You can't get everything you want, but I'm curious - if they transferred the street smarts to one of the other comedians wouldn't they just be considered white trash, culturally? It would be hard to pull off well. There are many examples of black characters in movies being valued and respected for their street smarts, while similar white characters are often negatively portrayed.
Plus there's a lot to be said for putting a character in a trope, then using it to provide commentary, or breaking the trope. Perhaps they won't do that.
Regardless, I wonder if a "perfect socially just" movie is possible that is also a blockbuster. Blockbusters depend on a strong cultural foundation that allows them to create a story in 90 minutes without having to give each character 30 minutes of backstory. This is done by tropes, roles, etc, and they needn't necessarily be negative. Street smarts are valued in our society, so this doesn't have to be a negative portrayal.
I'm certain they'll be playing on the "smart person has something obvious fly over her head" trope as well, which will play positively towards the street smart person, and will reinforce the idea that there are different kinds of intellect and none are necessarily better or worse than the other. Street smart person explains something, smart person misunderstands, or doesn't understand. Vice versa.
Regardless, the one thing this trailer does seem to show is that these comedians appear to be enjoying each other and there's good chemistry. That's probably the most important thing for Ghost Busters - it's essentially a buddy comedy, and I think they may have captured that. They will obviously be switching a lot of things out because of the gender swap, but I expect them to be dropping a lot of commentary along the way as well in the form of jokes and situational comedy.
That said, I doubt I'm going to see it in the theater. It'll be out on netflix or redbox soon enough for me.