>>358708071. Expanded Overworld - A full 3D world that looks like a forest,city,etc. like in other modern RPGs like BOTW/Skyrim/Witcher/Souls, not the miniaturized version we've seen so far in Pokemon games. Doesn't have to be Open World, just has to have a bigger scale.
2. Increased difficulty - Base game matches difficulty of the more difficult Pokemon games, and comes with an additional hard mode on top of that.
3. Features from Let's Go remain - Overworld Pokemon, Following Pokemon, Pokemon Mounts, Co-Op aren't ditched and appear in this game as well but improved from their version in Let's Go. Overworld Pokemon will have different behaviors and react to players - aggressive Pokemon will charge at the players, fearful Pokemon will try to run away. Co-Op will put more trainers in the Overworld, so most battles become Double/Triple battles.