There is no end to the speculation around the current production of Avengers: Infinity War. MCU fans are already eating up any small bits of news around the secretive production including debating who the villains (aside from Thanos) will be, and gawking every time a new cast member is added to the huge credits list. But no one could stir the pot better than the duo-directors behind Infinity War, the Russo Brothers. Tweeting from an unverified account, the directors shared the following cryptic but intriguing image.

Based on images this account tweeted out during production of Captain America: Civil War, many of which were later verified to have revealed tiny details from the movie, there is solid reason to trust that this is indeed a teaser straight from the set. Not to mention, the picture looks like it belongs in a Marvel movie.

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So what could it be? The Internet, of course, has plenty of guesses, but since the image gives us no real sense of scope and size it's definitely difficult to draw any real conclusions.

Considering the space travel that will be required of the Avengers in at least one of the upcoming two films that make up the Infinity War story, it could be related to new tech developed to allow them to do so. The blue-purple glow does feel very arc reactor-ish, so it might potentially ante tied toIron Man. Then again, Thanos also has a purple glow about him and his gadgets, so perhaps this is the vault door to the Infinity Gauntlet, where he's storing his massive weapon until its ready for use.

But if we're going to conjecture based on the glow, the infinity stone, or Tesseract, is also blue and was last seen in Asgard. Thor had a vision in Avengers: Age of Ultron of the Tesseract being shattered and the blue stone joining the others in Thanos's Gauntlet. Of course, this is Thanos's ultimate plan, to unite all the stones and wield the power of the Gauntlet, so it would stand to reason that in Infinity War we'll see him in possession of the blue stone (and, let's be honest, likely sooner in Thor: Ragnarok). And there's a certain Asgardian look to the set pieces design. Of course, it also looks like it could be part of a weapon. A hilt perhaps, or an energy source. The potential answers are (forgive us) infinite.

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Avengers: Infinity War boasts a sprawling ensemble cast that includes Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Samuel L. Jackson, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista, Pom Klementieff, Scarlett Johansson, Tom Holland and Anthony Mackie. The film arrives in theaters May 4, 2018, with the untitled sequel opening May 3, 2019.