Found this by searching for the Cat No, roughly translated...
http://www.google.co.uk/search?q=PCD...&start=10&sa=N
Quote:
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«Underworld» long-awaited new album, released ahead of Japan. こちらは 36Pブックレットをセットした豪華BOXに、Remixやインストを収録したボーナスディスク、さらにD VDを収めた2CD+DVD+ブックレット付き 超豪華初回限定仕様!※「デラックスエディション」と「初回豪華盤」のDVDの内容は異なりま す。 This is a booklet 36P BOX set in gorgeous, Remix and a bonus disc that included the installation, even containing a DVD Limited Edition 2CD + DVD + Super deluxe booklet! ※ "Deluxe Edition" and "luxury first board" of the DVD what is different.
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Another translation has the contents of the DVD as different.
So looks like a remix CD, 36 page booklet and DVD possibly with different content to the other edition.