Just one novel or all 3?

The first novel is pretty complex and convoluted, I don't see how they can do that in one movie, and the Chinese series took many episodes to cover. Besides, if it is a hit, they will have two books to sequelize, which will give the author time to write another one in time to make 3 sequels.

Don't know for sure, but looks like the first one only, with some characters and minor plot elements from the other two books (think I spotted Sophon, the giant stellar particle accelerator....). The Chinese series is 30 episodes long and only tackles the first book as well.