It’s evident that there are a couple of big things going on in Fantastic Beasts and Where To Find Them.
But it’s also teased in the trailers that there are muggles (no-majes) out there professing the existence of witches and wizards, and calling for another witch hunt.
When his creatures get loose, he has to stay behind and deal with the mess.
So not only is this movie introducing new characters, but there are a few events playing out at once.