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DX12 isn't going to magically make all games perform faster or look better. It certainly won't do anything to change things like Titanfall's 40GB of audio.

The main bottleneck it alleviates is draw calls and compute, neither of which use more space when you scale them up. In games where there's hundreds of thousands of things on screen at once (think Cities Skylines) it'll increase performance drastically but since all those items are just duplicates of each other the game itself isn't going to get any bigger.

The thing that takes most space in modern games is probably textures and they aren't usually performance limiting nor will DX12 allow any real improvements in them.

There were much more quality-enhancing changes between DX9 and DX10 yet DX10 updates for existing games only increased the size of those games by single digit to low double-digit percentages.