Personally speaking, I don't think Mappa could have even support OPM season 3 in their current state, but that's neither here nor there as J.C. Staff reprises their position as the studio behind OPM- and it's kind of not a good thing (but not in the way that you'd think).
J.C. Staff as the animation studio is the least of the concerns with this information because we're not even given a director.
The list of staff we have is: Series Composition, Character Designer(s), and Music. That's it.
And even with the limited information given, it's not a good look. We don't know if Sakurai Chikara will be reprising their role as series director or not.
What we do know however, is that for the first time in these 3 seasons, Chikashi Kubota won't be the singular lead character designer. Alongside her are first-time character designers Shinjirou Kuroda and Shirokawa Ryousuke, who are also rather new to the animation scene in general.
All in all, even with the trailer it does not result in a good look for the season. Certain cuts are awkward and sluggish, and while some of the combat is really well animated, it is still yet to prove it can hold a candle to season 2, let alone even the weakest moments of season 1.
I'm so sorry I'm so late to this :(( A thousand apologies seriously, I had some personal issues and I didn't find out about the trailer until half an hour ago :(
Nanatsuiro Drops Anime Trailer (?) I never found much information regarding this piece of PV, seems like to be the anime trailer but the final product suffered so many changes.
I've also found some douga (60 pages) for sale regarding this PV with director notes