Mark Ruffalo has hinted at his possible departure from the Marvel Cinematic Universe. The actor may make his final appearance as The Hulk in an upcoming Marvel film. He shared a photograph of himself in his CGI suit on Instagram. 

Fans compared this picture to the customary closing scenes from Bill Bixby's Incredible Hulk TV show. 

While the 'IW' mentioned in his post could be an abbreviation of Infinity War, as the photograph was posted recently, fans assume that it must be a more recent picture, probably from the filming of Avengers 4.

Avengers: Infinity War will be released on May 4 in the US, while Avengers 4 is slated to arrive on May 3, 2019. 

It is worth noting that there have been speculations that some major characters will die in Avengers 4.