1 Hour of Gameplay.
https://www.youtube.com/watch?v=RlgUUMgzKoI
Yakumo is getting a fourth weapon. Ryu's weapons are DLC.
https://next-play.com.au/ninja-gaiden-4-hands-on-preview-and-development-team-interview-meeting-yakumo-ryus-return-new-weapons-dlc-plans-and-more/
>HIRAYAMA: “There’s going to be a fourth weapon, for Yakumo, that will be revealed in the future so please, look forward to that. With regards to Ryu’s weapons … We are planning to add additional weapons in, as DLC. The DLC is included as part of the Deluxe Edition … Additional weapons are included in that, with that said, that gameplay content isn’t just limited to additional weapons. There’s going to be more content. And we’ll be revealing more details about what you can expect from that content in the future.”

Buy this game instead. If you have to goon, buy Stellar Blade. Do not give Sucker Punch money.