Some Fallout trademark has been registered, and the actor behind three dog tweated something that hints the next Fallout game. Now this is old news, but that's not what this is about. Fallout 4 will have to come sooner or later, so what do you want from the next game in the Fallout series? Changes, additions, locations, enemies, anything you can think of.
New Vegas introduced hardcore mode (needs mode, sleep etc.), so I hope to see that return. But my biggest wish is that they make companions the same way as in New Vegas, and not as Skyrim. F:NV had story arcs for every follower which made them more important to the player and gave them so much more character. In hardcore mode they could even die. Lydia was just a packmule, but Veronica, Raul or anyone ells of the followers NV? They were friends.