The official Twitter account for Warner Bros. Tours has been teasing Batman fans all weekend, reports. On Friday (June 6), Warner Bros. Tours posted that there's going to be a "big reveal" on Monday, June 9.

The first tweet the account posted was of the Bat signal with the caption, "We're getting ready to 'unmask' a big secret. Stay tuned! #wbtour." The post was re-tweeted by DC Comics. Immediately fans started wondering if the announcement is going to be "Batman v Superman" related.

Warner Bros. Tours then dropped another hint, this time posting a picture of three costumes from "Man of Steel."

"What's #Superman guarding? The curtain will be lifted soon! #wbtour," they captioned the photo.

Once again, they posted another cryptic tweet: "Look, up in the sky! It's a bird! It's a plane! It's... irrelevant, because our secret isn't about #Superman."

So what big secret is Warner Bros. Tours going to announce? You're guess is as good as ours but it seems like some fans have gotten close to figuring out what the big reveal is. One person tweeted asking Warner Bros. Tours if the reveal is about the Bat mobile.

"You're on the right track, but that's not our announcement! You'll see why on Monday," they responded.

Another fan asked if it had something to do with the Batfleck cave and again WB Tour said the person "wasn't far off." Some even suggested that it could have something to do with the Wonder Woman costume being revealed.

In related Batman news, there's a new rumor that Jesse Eisenberg's Lex Luthor will be completely different than previous versions.

"A source close to 'Batman v Superman: Dawn of Justice' has informed me that production is heading to LexCorp next week. In Zack Snyder's 'Man of Steel' sequel, LexCorp is described as a young, edgy company. Think of it as a .com or Google type workplace. It's a smart company with a stylish vibe, a youthful clash of rock and roll, preppy, and nerdy employees. Hipsters! The LexCorp scene will be shot on June 12th or 13th and it will take place in the fall. Actors will be wearing layers with long sleeves, lightweight jackets, and blazers," the site wrote.

UPDATE: Warner Bros. Tours finally makes their big reveal. Check it out here

What do you think Warner Bros. Tours' big reveal is?