I also started with the first retail disk on ps4, then bought the american wilds retail disk, and it works as expected. My ps4 is not typically connected to the internet, but i regularly connect to download updates. I'd assume all the american wilds content is on the disk.
@Jayson there's a bunch of stories about floating a jeep across using the current with the engine off, but a b6a will drive the north route no problem. The b6a does take a bit of care to drive, though.
Take the road to the north from the garage, and from the very end of the road, spot a small circle on the map about 60M north west. If you drive straight to it, it's a bit hairy at first, but you can make it with less than 20 damage pts from water as long as you keep the tractor moving. Once you get there, the rest of the way should be pretty obvious, but take the long way keeping to shallows. Once you get to the northeastern island, switch to the k700 or whatever, then it's a long slog to finish the map, but it'll at least get you another four hours out of the game, haha.
@Unster I do have plans to get into the PC version, but I don't know if I should build something current in preparation for MR2 or just blow a bit of cash on a used gaming PC... my laptop might explode if i try to fire it up. I've been a console gamer for a long time for this reason, I just can't keep up with requirements, and I'm a bit of an idealist/perfectionist with hardware...