I made the 'Haunted Mansion' comparison back when the first advert hit. I continue to think, however, that it's a result of not going back to the original film's concept art, but the art department being told to go back to 'The Real Ghostbusters' cartoon for visual inspiration. What we see, so far, fits right in with that cartoon's style of ghosts.
Unfortunately, this new trailer actually proves this is going to be awful... Why? Because it shows Hemsworth's character getting abducted just like that leaked Reddit story reveal claimed he would. That, the way he turns in villain-style to the camera and confirmation of the Reddit leaker's reveal about the 'emblem ghost' effectively replacing Stay Puft, seem to increasingly point to that alarming Reddit leak as being genuine.
We already knew Feig's story pitch from the leaked Sony e-mails (complete with a cringe-worthy musical number) and it was horrifically bad. The Reddit leaker said very little has changed, aside from taking away the 'alien ghosts' idea (potentially an interesting concept, but he literally pitched it as nothing but a gimmick, instead of a plot-point to build off of).