More numerous music audio files

More recorded dialogue

More cut scene type embellishments ( not huge use necessarily, but added oomph put into some of the main story quest line points)

Stepped up resolution in the graphics including light and shadow dynamics

More varied game world, underwater animations etc.

The whole crafting setup for settlement creation has a lot more capacity for individual customization, much more versatile than Hearthfire

I've little doubt that DLC might also include some new things, with a music library expansion being one of them! Be interesting how big the game will actually be when the last DLC drops..... Hmmm don't even want to think about that sad day.....

Bigger is better (so I've been told anyway ha-ha)

It will be exactly the same as Fallout 3 just with a lot more tin cans scattered across the world. And each tin is a handcrafted unique.

Cut content.

?

Cut content is where we get about 15gbs

But off topic. I wonder how much content there will be in FO4 bethesda is notorious for having tons of it.