3. Vehicles
Do you want them, or would they ruin everything? Fan forums have debated at length both sides of this, and whether or not they actually make it into the final game is probably something that'll be shown first, as it's a pretty big shakeup to the core series' formula if they're included. Being able to craft and mod certain things onto your motor of choice would be the best way to go if they are, letting you bolt on metal spikes and other Mad Max-style armaments if you were say, heading into a rougher part of the city or any area of the Wasteland. Likewise, leaving them out has the benefit of forcing you to take in every part of the exquisitely designed world around you, being what some would call an essential part of the Fallout experience, so it could go either way.