Source: KABA-9201-CD | Deadman Wonderland Soundtrack CD 1 – VGMdb (http://vgmdb.net/album/26101)
Edit: On their official website, they said that a soundtrack will be releasing along with a Blu-ray/DVD of the anime. There are 2 samples featured on the website (Sample B being my favorite :3)
http://dwl.jp/goods/index.html#camp
Double Edit: Scroll up when you click the link above lol
Song 3 is the opening track of Deadman Wonderland, in fact i quite like the whole EP.