It has recently surfaced that director Zack Snyder was once considering to feature Metallo as one of the main supervillains in Batman v Superman: Dawn of Justice. The fictional character, like many others, was ultimately written out of the script at some point.
The confirmation comes (via Batman-News) through the official ArtStation profile of freelance concept artist Rob McKinnon, who also worked on various other pieces that never made it into the movie. The specific illustration below shows Metallo in a very different form in comparison to the source materials, albeit threatening.
Metallo has always appeared as a cyborg in the comic books, though his level of humanity has differed in some instances. Mostly, however, he is a tin can that has a kryptonite power source in the place of his heart. This makes him a walking grim reaper for Superman, having come close to finishing off the Man of Steel at certain junctions with weapons powered by the alien mineral as well.
This is not the first time that Metallo has surfaced for Batman v Superman: Dawn of Justice. The casting reports from a year back gave hints of the supervillain making his silver screen debut. Snyder even revealed once that he almost put the Joker and Riddler in the movie as well. There was a lot going on for the project, which is probably why the final product ended up a bit muddled.