Batman V Superman made a huge mistake by giving away something that nobody saw coming before that trailer debuted, but Justice League has handily moved around that issue by focusing far more on tone and known plot elements than anything new.
Moreover, this Justice League trailer is also a big win for the folks at DC and Warner Bros. because of how it is leaning into potential spoilers that audiences have already caught on to.
Most fanboys have generally come to the consensus that Superman will return from the grave (possibly in a black suit?) during this film.
If you ask us, it’s a smart move that has really paid off today.