User blog comment:AnimeMegaFan30/DBZ Kai Double Header on May 21st; Samurai Champloo Marathon on May 28th/@comment-4107416-20160510062809/@comment-7866392-20160510235900

The replacement will probably be a show that FUNimation will be simulcasting with a broadcast dub, since that would be something that Toonami might not be able to premiere right away.