I doubt it. Filoni says there are a lot of clues in the episode, some that longtime fans will already be able to crack.
Parallels have been made to the Mortis Arc, with the Owl possibly being a Celestial Guardian watching over Ahsoka.
He has promised that she is not returning as a Force Ghost, that she doesn't have the ability too.
That's about as much as he has revealed so far.
He says we "may" see her on Rebels again, but don't count on it, because Rebels isn't her story. We will see her again, in the future though, he promises.
We also shat bricks when we realized that the Sith temple is the same architecture seen on Moraband, and more excitingly, pic related from Mortis...
Everything happens for a reason.