IP Man struggles setting up a school in China after the war. He has a hard time getting students, being accepted by the other schools, and then there are those foreign devils (the Brits).
This one is not as good as the second, and seems to be "forced". It's like they wanted to make more about his life, but didn't have a lot of material, so half the movie feels like filler.
The cameo you were hoping for in IP Man does actually take place here, and it's cute, but overall if you want to see what a badass this man was, just see IP Man, and then Wiki the rest...yes, THAT Bruce Lee...