WARNING: Don't keep reading if you don't want to spoil the ending of "The Wolverine," in theaters now.

We all know Hugh Jackman's Wolverine will be in the upcoming "X-Men: Days of Future Past" -- but a brand new post-credits scene in this weekend's flick poses some interesting questions about the 2014 mega-movie.

If you didn't stay for the scene, here's what you missed: 

Two years after the events of "The Wolverine," the title mutant is walking through an airport security gate, opting for a pat-down instead of going through the metal detector. A commercial for Trask Industries is playing on the monitors in the background.

The coins in the tray rattle, and he turns around to see Magneto (Ian McKellan), who explains that he needs his help and brought a friend to recruit him. That friend: A very much alive Professor Xavier!

"As I told you once before, you're not the only one with gifts," Professor X says when asked how it's even possible he's around.

Cut to black!

So, the two biggest things at play here are the return of Magneto's powers and Professor X himself ... both of which were presumed dead at the end of "X-Men: The Last Stand."

If Magneto's powers are back, that means the so-called "cure" didn't work and mutants like Rebecca Romijn's Mystique and Anna Paquin's Rogue could have their superhuman abilities again too.

As for the return of Prof. X, Patrick Stewart didn't offer up much explanation at a recent Comic-Con press conference -- saying "Something happens [to bring him back], that I'm not allowed to talk about."

The new movie will also have to address Wolverine's lack of adamantium claws, which he lost in the finale of this weekend's flick.

"The character you see at the end of Wolverine is very much the character you see at the beginning of 'Days of Future Past,' Jackman said at the same presser. "It's quite a journey."

Want to know more about the movie? Click here for 10 Things We Learned About "X-Men: Days of Future Past" at Comic-Con.

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