I'd like to see.
- invasion of enemy bases - AND TACTICAL NUKES!
- Vehicles - bike, car, truck, tank, helicopter.
- build multiple outpost and trade routes. Roads and highways linking biomes.
- multilayered 2D. Basement and trench layer + ground layer. Stairs and ladders. IMAGINE 1917 TRENCH WARFARE.
- collectibles and rare items found all over the planet. Research/vehicles/roads needed to find locations and story. For instance an ancient missile silo with a nuke can give a pesky neighbor the doomsday. An actual spaceship crash or landing to search and raid.
Well, You've just created a list of the most common suggestions on the forum, just FYI.
Tynan said many times that implementing of travelling between parts of the map will require a lot of work, as well as implementing of Z-levels, thus if it ever gets done it's not any time soon.