Before watching the trailer, just for fun, my guess:

Mild sci-fi fantasy peril, the baby Yoda eats something yucky and ethically questionable, there’s a new bad guy who hopes that nobody finds out about his secret weakness, twelve pages of new mandolorian lore that retcons a bunch of stuff from the other movies, mando figures out the bad guys weakness and baby Yoda uses the force the movie ends just as we introduce some other baby Star wars critter.

After watching the trailer:

Hm. Yeah, I have no idea what this movie is gonna be about.