Batman V Superman: Dawn of Justice was a jumpstart for the DC Extended Universe, running on from the fairly standalone Man of Steel into a massive wider world to rival Marvel’s. As a results, along with introducing Batman, Wonder Woman and Lex Luthor, it was full with loads of easter eggs and hints at what to come, ranging from the subtle (Robin’s suit in the Batcave, pointing towards an Under the Hood adaptation) to the painfully obvious (Diana Prince opening up Quicktime files of the metahumans).
The most pointed pieces of foreshadowing was the Knightmare sequence: during his quest to crack Lex Luthor’s drive, Bruce Wayne (Ben Affleck) was subjected to a dream/vision/time travel journey (take your pick) care of The Flash (Ezra Miller) that showed a dark alternate future where Superman had gone full dictator and villain supremo Darkseid had taken ahold of Earth, trying to turn it into his own version of Apokolips. This was used ostensibly to motivate Bats into an all-out war against Supes, showing his fears come real, and at the end was hinted to be a key motivation for the formation of the Justice League; although for many it was just a captivating alt-future scene.
Zack Snyder recently shared a behind-the-scenes photo on Vero of the trenchcoat costume worn by Batman in the sequence, giving a better look at his battle-damaged armour (check out the bullet marks on his chest logo) and newly minted rifle (which sports a Joker playing card, a nod to his greatest nemesis, and is attached with climbing rope). The sequence is readily available, but there’s actually been no clear promo shot of Ben Affleck in the costume yet, so this is a nice treat for DC fans.
Snyder’s been using his Vero feed a lot recently to share previously unseen photos from the production of both Batman V Superman and Man of Steel, giving fans looks at Superman screentests, Wonder Woman stills and more. These don’t have much relevance to Justice League (which is now in post-production), so not much can be really read into them. They do still serve as a tiding over until we get more news on that DCEU team-up.
The Knightmare sequence may be hard to logically explain in the context of the movie – as already stated, it’s not clear if it’s a dream, vision or time-travel – but it’s certainly a striking scene. Inspired somewhat by the Injustice series, which told of Superman becoming a villain after the death of Lois Lane (an event that the time-warping Flash even alluded to), it promises a potentially dark future for the DCEU; one that fans will no doubt be happy to embrace. Batman and the metahumans will be taking on Steppenwolf (Ciarán Hinds) in Justice League, but it’s expected his nephew and big bad Darkseid will appear in the sequel, perhaps bringing some knightmare-ish destruction with him.