I know some people were wondering this after the Netflix deal. Looks like this confirms it.Confederate, HBO's controversial series that was to imagine a time after the Civil War where the South won, is no longer in development at HBO, according to Vulture.
Sources with knowledge of the project told Vulture that showrunners D.B. Weiss and David Benioff don't have any series left at HBO following their move to Netflix. Weiss and Benioff, who are best known for creating Game of Thrones, announced Confederate as their next project at HBO in 2017. The announcement was met with immediate criticism from people who voiced concerns over whether Benioff and Weiss were the right people to handle the show. HBO chief Casey Bloys later admitted the network could have done a better job rolling out the announcement, but he hoped "that people will reserve judgment until there is something to see."