Sean Bean is cast in season 2. If you recall you heard is voice in the show as sampled recordings.So you already know that he is Mr Wilson and that he is indeed alive. Season 2 is going to be good too.
In terms of the movie.
The movie is a good romp and its primary end to end of a train but it takes a while to build and skips a lot of the different parts of the train to jump closer to the end which then feels a little rushed and an odd ending. But then based on the books the train is REALLY long and you can not really do that for a 2 hour odd movie so the train felt quite short in the end on the movie while the show better reflects that it is actually a BIG train.