In the film Batman Vs Superman: Dawn of Justice, Superman sacrifices himself to assure the Trinity's victory over supervillain Doomsday. However, following Clark Kent's funeral service, the film ends with a shot of dirt rising from his grave, leaving the hero's fate up in the air.
While there is definite confirmation that the Man of Steel will be definitely returning for Justice League, we have no way of knowing how the resurrection will take place.
Since its a long way to go till Justice League releases on 17 November 2017, Henry Cavill surprised fans by posting a close-up shot of what appeared to be the all-black Kryptonian suit he will wear after his resurrection:
Cavill's post may hint at the DC Comics story arc his resurrection will be inspired by.
In the early 1990s DC comics Death and Return of Superman, when Superman died during his battle with Doomsday, he returned from the dead severely weakened and not at full strength. He wore an all black suit until he returned to his normal super-strong status. The comics also had the newly brought to life Superman sporting super-long locks that went well with his newly acquired 'I-don't-care-about-saving-the-world' attitude.
A few die hard fans have already started a hashtag #MulletForSuperman hoping Cavill will mirror the look in the new film.
— Mullet For Superman (@Mullet4Superman) August 15, 2016
— Payton Steiner (@PayondeAwesome) August 1, 2016
— Caleb Sapp (@calebsapp) August 16, 2016