Nokia 8 is still not present in China and the US, but it looks like these two key markets will receive special versions of this flagship. Two variants for the US have just been spotted on FCC, and they both feature 6 GB RAM and 128 GB internal storage.
https://www.notebookcheck.net/Nokia-8-with-6-GB-RAM-and-128-GB-storage-hits-FCC.249894.0.html