It appears that some physical copies of Horizon Forbidden West have made it into the wild and details are starting to leak out. One Twitter user who goes by Joelthatguy revealed he got a copy from a friend and despite posting non-spoiling details, all his images have gotten a copyright claim by Sony Interactive Entertainment.
Some non-spoiler details we can say is that the prologue is very long and the user did not get to the title card until 2 hours of gameplay. Open-world was also not available until the 5 hour mark.
Horizon Forbidden West officially releases on February 18 for Playstation 4 and Playstation 5.