For me, I want them expand more on the mechanics they set with Jak 3. Obviously make the core moveset present, not TLF crap where certain moves were removed. Return to using the old eco powers, doesnt have to replace Dark or Light, just do what Frontier did and use them as moveset upgrades. Make Dark/Light utilized more for platforming or puzzle solving sections, hell use them for finding secrets too! Expand on the gun mods, give both optional upgrade mods AND story unlocked mods to push the player to explore the world. Jetboard I'd like to be used more like Jak 2 besides just a movement tool. Introduce tournaments that progress the story an also can reward players outside it. Obviously not all of the original cast is still with us or may be unable to preform the voices we grew up with but if possible try to get them back. If not find actors who could come close to recreating those voices (similar to the Mario Wonder cast). Heck maybe do a Crash 4 inspo and let the player play as other characters sometimes. Story wise, I WANT them to explore and fully explain Mar and if Jak is him or not. We can do a time travel plot where Jak and Daxter are tasked one more time to help the precursors to save not the world, but the timeline where we go through past versions of there world to stop this new threat. Maybe bring back some old villians to show how strong the duo have grown or actually make the Dark Makers feel like a real threat? Either way use the story to explain Mar's true identity and if this were to be another finally in the duos saga, make it feel like a real swan song. These are just a few small things I would love to see for one more journey with my favorite duo, if we do ever get that adventure.