The story of Christopher Robin sees Ewan McGregor as an adult Christopher, with a family of his own.
It appears the story might have a similar premise to that of Steven Spielberg’s Hook, where the fantasy world of Christopher Robin’s youth turns out to have been real, much to the character’s surprise.
Either that, or Christopher Robin has actually had a psychotic break and the entire movie will be a hallucination.
The teaser shows him seeing Winnie the Pooh again, and not believing it.