Earlier today, 'Man of Steel' director Zack Snyder and star Amy Adams sat down with Kevin Smith at a special fan event for the upcoming Blu-ray release, with Henry Cavill telecasting in from London -- but the making of that film wasn't all they discussed. Snyder dropped a few hints about his sequel, working under the tentative title 'Batman vs. Superman,' which, obviously features the caped crusader going up against the Man of Steel himself. 

Yahoo hosted the special fan event, which also featured footage of a sit down between Snyder and Michael Shannon, who played General Zod in the film, to give fans a sneak peek of some of what they can expect from the Blu-ray release of 'Man of Steel.' Host Kevin Smith interviewed Snyder and Adams, and fans submitted questions for the director and stars.

It's been rumored that Superman nemesis Lex Luthor will be featured in the upcoming sequel, and when asked about Superman's space heritage, Snyder remarked, "At its core, Superman is an alien. He comes from an alien world … Lex loves to call him an alien," to which Smith replied, "That's a spoiler, folks." So now we seemingly have official confirmation that Lex Luthor will be involved in the sequel.

As for the unofficial 'Batman vs. Superman' title, Snyder explains, "Part of the fun of the idea [is] to be able to sort of play with that relationship, whether they're fighting or they become friends … That's the fun of making movies and playing with this mythology," but he reassures us that there will definitely be a fight between these two heroes: "… Of course, there will be some physical conflicts, as well."

But does the death of Zod in 'Man of Steel' factor into this sequel? Snyder teases, "Maybe we'll see the repercussions of that in the next film." Speaking of death, Snyder caught some flack from critics who found Superman to be too careless in the first film. The director explains that "probably 5,000 people" died in the Metropolis attack. "For me, that was part of it. No, there's real consequences … Not to compare, but if you look at 'The Avengers,' they trash the city and nobody thinks about how many people are dying." But he goes on to explain that the personal repercussions of that damage will definitely be on Superman's mind: "There's a sadness at the end of the movie ['Man of Steel']. That's a thing that weighs on Superman."

Snyder also revealed some special artwork, commissioned by artists for the charity We Can Be Heroes, which you can purchase on eBay. The artists were asked to take inspiration from 'Batman vs. Superman,' and you can check out the artwork below:

Batman vs. Superman artwork
We Can Be Heroes
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Batman vs. Superman artwork
We Can Be Heroes
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Batman vs. Superman artwork
We Can Be Heroes
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