Adult Swim announced last week that it would revive the Toonami anime block after asking its followers in April if they would like it back. According to their schedule, Deadman Wonderland
and Casshern Sins
are set to air at 12:30AM and 1:00AM, respectively, on the morning of May 27 when the block returns, along with older Adult Swim shows. The two series will air again at 3:30AM and 4:00AM after the schedule repeats.
Source: Adult Swim Schedule