David Ayer's Suicide Squad is without question an important in statement in the developing DC Extended Universe. Following after Man of Steel and Batman V Superman: Dawn of Justice, there's already talk of Ayer's film getting a sequel in 2018; not to mention the reports that multiple Suicide Squad spinoff movies are currently in the early stages of development.
So far, the Suicide Squad marketing campaign has earned a positive response, with trailers that have incorporated intriguing, stylish footage of DC criminal characters that are brought to life via the likes of Margot Robbie (Harley Quinn), Will Smith (Deadshot), Cara Delevingne (Enchantress), Jai Courtney (Captain Boomerang), and Jared Leto (the Joker). While early signs point to Enchantress being the main antagonist in the movie, it's still something of a mystery as to who the film's true "villain" - amidst a sea of anti-hero and super-villain types - actually is.
Speaking to Total Film, the film's director Ayer and producer Charles Roven addressed who the mysterious army is we see engaging with Task Force X in the trailer footage, identifying them as the Eyes of the Adversary, as Roven puts it:
"Let's just say, when [the Squad is] called in to do this mission by Amanda [Waller], these are one of the things they encounter. They don't know how they got here, but they're weird and dangerous and yet they're wearing military uniforms."
Director Ayer goes on to back up that statement claiming "nobody's safe" from the Eyes - so just in case we weren't already cautious, the pair have seriously increased their threat factor by implying they're essentially an army of demented hot-heads who know what they're doing in terms of being ordered to eliminate the members of Task Force X. Who's ordering them and why, is the question.
In short, it's still unclear who the big bad villain of Suicide Squad really is. It's easy to presume Leto's Joker is an antithesis of sorts, but with an army going by the name of the Eyes of Adversary, it implies that, well, the baddie in charge is Adversary - and by the word's very definition is a very nondescript way of saying the squad's opponent. Adversary is, however, a DC character that emerged in Superman #579 in 2000 and is an antagonist to the Justice League, but nowhere did he have a faceless, mindless army of soldiers at his disposal.
Whoever it is the Suicide Squad are squaring off against (with, again, Enchantress being the most likely candidate right now), it's likely we'll see a glimpse or hear a murmur prior to release. After all, it seems a tall order for DC to be able to keep the movie's big baddie totally under wraps until the film hits theaters.
Suicide Squad will arrive on August 5, 2016, followed by Wonder Woman on June 2, 2017; Justice League Part One on November 17, 2017; The Flash on March 16, 2018; Aquaman on July 27, 2018; an untitled DC Film on October 5, 2018; Shazam on April 5, 2019; Justice League Part Two on June 14, 2019; an untitled DC film on November 1, 2019; Cyborg on April 3, 2020; and Green Lantern Corps on July 24, 2020.