system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does a movie like Suicide Squad have the trailer out now, but a release date in over a year from now?

What happens between now until release?
gpt
> What happens between now until release?

Did you see how many of the scenes had special effects? A lot of them, right? Adding special effects to raw film takes awhile. The raw, effects free, filming has been done. What they're doing now is adding effects, composing and adding music, etc. 

Basically, they're turning it from green screen to final film.