The author of the Deadman Wonderland manga will be continuing the manga soon according to ANN so there is hope of a second season. However, some people have mentioned that the anime did not do very well in Japan so it is still unlikely. But if there is more source material then there's at least a chance.
December 29, 2012 - 4:48pm
#1
Manga returning from hiatus
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"When you truly care about someone, you don't need any specific reasons to justify your feelings. If you don't know why you feel the way you do, then you can't lose that which causes you to care."
How does this give us hope for a second season?