Update: Marvel's big announcement was that the original Fantastic Four line-up are returning to the comics this August in Fantastic Four #1. The comics will be written by Dan Slott with art by Sara Pichelli and mark the return of Marvel's First Family: Reed Richards, Sue Storm, Ben Grimm and Johnny Storm. This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. Fantastic. https://t.co/dsIxmyXSDy #MarvelComics #FantasticFour pic.twitter.com/eDf4ZZ5iGj — Marvel Entertainment (@Marvel) March 29, 2018

Original story: Marvel has a special announcement coming on Thursday, and fans are being asked to 'Please Stand By'.

On its official Instagram account, the comics giant posted a graphic that reminds us of a video game loading card, with a time and date of "3.29.18 12pm ET".

It also features the logos for four Marvel franchises: Spider-Man, Captain America, Black Panther and Captain Marvel.

This content is imported from Instagram. You may be able to find the same content in another format, or you may be able to find more information, at their web site. View this post on Instagram Tune in tomorrow for a special announcement. #MarvelComics A post shared by Marvel Entertainment (@marvel) on Mar 28, 2018 at 9:01am PDT

It's worth noting that the post also contains the hashtag #MarvelComics, which could mean the announcement is tied to the publishing division, rather than anything to do with the on-screen Marvel Universe.

One fan theory which is picking up steam is that it could be something to do with a crossover between Marvel and the popular post-apocalyptic Fallout video game series.

This is because the image is reminiscent of scenes used by the Bethesda franchise.

Bethesda Softworks

But everything else is just speculation at this point...

Marvel fans currently have plenty to be excited about, with just one month to go until Avengers: Infinity War hits cinemas.

Making sure that excitement doesn't die down, yesterday Marvel dropped some brand new Infinity War footage featuring Groot as a teenager.

And over the weekend, fans also got to see Spider-Man (Tom Holland) officially become an Avenger thanks to Iron Man (Robert Downey Jr).

Avengers: Infinity War is released in UK cinemas on April 26 and US cinemas on April 27.

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