This past weekend (Dec. 6th), the annual CCXP Media Convention in Brazil included a 6-hour segment by Warner Brothers.

While most of the 6 hours was worthless, there was a Suicide Squad panel which included Director James Gunn (of Guardians of the Galaxy fame) and several cast members.

Along with the panel discussions, they include some quick clips of the upcoming movie. Among these was the following 6 frames showing King Shark about to chomp on someone.
(Note that I converted it to a gif in order to slow it down and allow it to loop):
https://i.imgur.com/CDNbNm1.gif


For the normal speed, higher quality MP4 video:
https://i.imgur.com/h1ZK5g3.mp4


During the panel, Gunn confirmed that the movie was going to be very violent, bloody and gory; so we can only hope that we get to see King Shark munching on people on-screen, and not cutting away at the last moment.

Rodent