It is early days to decipher the meaning of the probably significant fourth plenum.
Plenum are a follow up of the Party Congresses, which last occurred in 2017. They are focused on different areas. A famous one was that of the third plenum in 1978.
This one was held many months after its predecessor. Its significance is hard to deduce from its communique.
Here is one very early story which reinforces China’s planning around Metropolises as opposed to second and third tier cities. Not that they are not important it is just that the focus has switched.
See this story below and take the time to read it more than once.