After it was announced last week that The Post was to be given a limited release on December 22 of this year, articles began removing the title "The Post" from their descriptions. I had originally thought that this was in error, but it now appears clear that they are likely going to change the title.
I imagine this change is meant to draw better attention to the nature of the film's story. Considering the film was optioned just last month, has yet to shoot and already has a release date inked in...the powers that be likely want this to capture as much of the current political climate as possible. Were the film to be called something like "The Pentagon Papers" instead, it might be a bit more alluring (at least to American audiences I suppose).
IMDbPro lists the "The Post" as the film's working title, with "The Pentagon Papers" and "Untitled Steven Spielberg Project/Untitled Steven Spielberg Pentagon Papers" as 'world-wide' working titles. I'm interested to see if the new name will make it seem more captivating, or help draw the mind away from thinking it's just about a team of journalists working against a powerful foe, similar to the recent Best Picture winner Spotlight (which I absolutely love). We'll find out soon enough I should think. Until we do, for the sake of ease, I'll continue to refer to this project as The Post.