
The change of heart comes after Sony and Guerilla told customers they'd be limited to the version of the game they bought. If you started on PS4, in other words, you'd have to buy another copy to take advantage of PS5 features.
Don't expect a similar concession for other PS4-to-PS5 upgrades. Ryan made clear that all first-party cross-generation exclusives "moving forward" would include a $10 upgrade option for the PS5 edition. If you pick up the next God of War for your PS4, you'll still have to pay for the PS5 release — you just won't have to pay nearly as much.
This pricing won't affect third-party studios, some of which have offered free PS5 updates (such as for Star Wars Jedi: Fallen Order). However, it does set expectations. Sony clearly wants gamers to cover the costs of PS5 updates, and releases like Forbidden West are the exceptions to that rule.