Well, the pitch says it revolves around a doomsday prepper (John Goodman) and Mary Elizabeth Winstead in a cellar, as the prepper claims he saved her from a "chemical attack" (read: giant-ass kaiju wrecking shit).
So, I want to believe the kaiju is in it and this revolves around that unexplored segment of monster movies: what happens after the monster wrecks shit and what happens to the people in that scenario?
Not so unexplored. You should watch Monsters. Great film