I was never really that big into the fallout franchise but I am still very curious as to what they can add to the game.
It's been confirmed they've added settlement building and a huge amount of crafting in it, plus their official game footage shows the player flying a jetpack in the armoured suit you can have as well as flying a vertibird, in short they've added lots and lots, I can also confirm that the game is 28GB in size which is massive for any game especially if it's compressed.