So what does this mean for Justice League? Well, obviously Superman will come back to life at some point during the movie, either naturally or through some process that accelerates what we saw at the end of Batman v Superman: Dawn of Justice. However he returns, Henry Cavill's tease suggests the Man of Steel will be back in black (had to do it). If Zack Snyder is following the source material closely, then Kal-El will be significantly de-powered, and that black suit will be the only way for him to effectively join the fight against Steppenwolf and his Parademon forces. Ideally the "blackness" will only remain on his costume, as we don't need a mind-controlled Superman or one who's especially angry. As for where the suit will come from, my guess is that the abandoned Kryptonian ship will produce it, just like it provided Superman's first costume in Man of Steel.

However, don't forget that the official Justice League photo features Superman wearing his traditional costume alongside his superhero allies. While it's possible this fashion choice was only for the sake of marketing, it seems plausible that once the black suit has fulfilled its purpose, i.e. restore him to full health. Once that has happened, he'll go back to wearing his old outfit, which he'll solidly rock in 2019's Justice League 2 and the in-development Man of Steel sequel.

Superman will fly back into action when Justice League opens on November 17, 2017. If you have your own ideas about how the black suit might be used, let us know in the comments below.