It looks like certain PS4 games will begin denoting on their boxes if they're available for upgrading to Sony's next-gen console. The box art for Immortals: Fenyx Rising was just recently revealed, and it features a sticker which points to certain PS4 games being available for upgrading.
Below, you can see the box art for Immortals Fenyx Rising's limited edition. As VideoGamesChronicle first noted earlier today, there's a "PS5 Upgrade Available" badge at the bottom of the box art, and this could be Sony's strategy going forward for letting consumers know whether a game can be upgraded to run on the PS5.
When it comes to PS4 games being available to upgrade to the PS5 later this year, it's entirely up to the third-party publishers to decide. Sony's leaving it up to the developers to figure out whether their games will be available for a next-gen upgrade, and so far the likes of Cyberpunk 2077, Marvel's Avengers, Destiny 2, and now Immortals: Fenyx Rising have opted to make their next-gen upgrades available free of charge.
Right now, we don't know Sony's strategy when it comes to their first-party games. Microsoft has been entirely transparent about their first-party games like Halo Infinite being available for both the Xbox One and Xbox Series X/S, but Sony appears to be adopting a more divisive strategy between consoles, previously saying that they "believe in console generations." Right now, Sony is yet to announce any first-party games available for both the PS4 and PS5, with the likes of Ratchet and Clank: Rift Apart and Demon's Souls being PS5 exclusives.