No matter the context, I’m happy to see that the film will be engaging with the idea in some way.
It’ll be cool. I just don’t understand why fans really want cloning to be brought back into the franchise. The cloning stories that the old expanded universe told involving Palpatine, Luke and Starkiller were just so ridiculous and I would go as far to say they were awful. It just felt like fan service at a ridiculous new height and power. I do believe that J.J. Abrams, Kathleen Kennedy and everyone else at Lucasfilm are way too smart to think of and include an idea of Rey fighting a Dark Side clone of herself. I honestly don’t know why fans would want to see something as bonkers and nonsensical as this idea sounds to me.