#3 Harper and Rowan return

WWE announced on this week's RAW that 6 Superstars will make their main roster debut soon. They also announced the return of Kevin Owens and Sami Zayn, who have been out of action due to injury.
We could maybe see a few injured Superstars from SmackDown return too, top among them being the tag team of Harper and Rowan. The former SmackDown Tag Team champions are both currently out of injury, which could not have come at a worse time for them personally, as well as SmackDown Live.
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Rowan first suffered an injury in August and was put on the shelf for a few months, and a few weeks ago, it was announced that Harper has also undergone wrist surgery.
It may be a little soon for them to return, but there could be a possibility that they will at least have a promo segment on SmackDown.
A top WWE star is missing in action