This should look pretty good in 4K UHD if Warner jacked up the bit rates unlike the one on Blu-ray which was quite bit starved, and didn't look that pleasing when projected.
This package (embossed 4K Steelbook) is exclusive to Japan. I ordered this when it went on sale but then cancelled it hoping to find a cheaper option and then it sold out. It's back in stock so I pre-ordered it again. Options are;
US - 4K Amaray version Best Buy $29.99
Zavvi UK - 4K deluxe box set (this is the most comprehensive version and contains the 4K UHD and three other versions on Blu-ray with all the special features) @ $50