This past April, Harper revealed that he'd requested his release from WWE, only for it to come out later that his request was denied. On top of that, his WWE contract, which was set to lapse in November 2019, had six extra months tacked on, due to time missed for injury. Harper's last bout to date was a dark match against EC3 from shortly after WrestleMania 35.
While it seemed like Harper might just sit at home until his deal expires around May of 2020, Mike Johnson of PWInsider is now reporting that Harper is expected to be at TVs this week.
Said Johnson, "We have heard rumblings that Luke Harper would be at this week's TV tapings. So are they putting Harper and Rowan back together? I don't know, but you never know..." (Credit to Heel By Nature for the transcription).
Rowan and Daniel Bryan did lose their SmackDown Tag Team titles last night at Extreme Rules, so WWE putting the two in different directions going forward is possible.