3. You Can Ride Vehicles
Many mods across Fallouts 3 and New Vegas allowed for the implementation of bikes and cars, and although these aren't vehicles that'll be making an appearance in Fallout 4, you can hop in the many gunships you've already seen in the trailers. Whether they'll be directly controllable or not is something Bethesda are playing close to their chest, but can you imagine V.A.T.S inside a gunship? You could queue up a whole field's worth of enemies and blast the lot to kingdom come. Failing that, it could be something closer to Metal Gear Solid's transportation system, where you choose to be picked up/dropped off at certain points on the map. Either way, it's a pretty sweet addition, and something that'll make getting around the expansive map even easier.