There has been a lot of rumors & discusion as of late about what will be the next show on Toonami. Acording to a twitter post by Jason DeMarco (VP of Strategic Marketing & Promotions for Cartoon Network & Adult Swim, also the man behind Toonomi), Samurai 7 will be premiering on the action cartoon block in the coming months. The show originally aired for 26 episodes in Japan during 2004, then later dubbed by Funimation in 2006.
With both Deadman Wonderland & Cowboy Bebop ending their runs in two weeks, we could see the show as early as the end of the month taking Deadman's premiere spot while DW occupies the 2:30/5:30 time slot. This is if Toonami plans on keeping the rerun block intact.
Update: According to the schedule on adultswim.com, Samurai 7 WILL be taking Deadman Wonderland's spot starting August 19th.
Original Twitter Post from DeMarco: https://twitter.com/Clarknova1/status/230421858359574528
Full News Story: http://therealjpoe.com/2012/07/31/samurai-7-to-be-on-toonami/