Andreas Preuninger, Porsche's well spoken head of GT development, has said that the next 911 GT3 RS will be differentiated even further from the GT3 than past generations, but that does not include three pedals for your driving enjoyment.
Instead, it'll have PDK. Now, I know what all y'all are saying right now. It's things like "I want three pedals!," "Real driver's cars have a manual gearbox!," "Porsche is so dumb I'm never buying any of their cars ever not because I can't afford them but because they don't offer a manual transmission!," or "I like to complain!"
But hey, PDK is pretty great. The RS is a track focused car, and it sounds like the PDK in the RS will shift even faster and ferociously than the one in the stock GT3. I love PDK, so I'm gonna take an unpopular position (I've been doing that a lot lately) and say that PDK won't ruin the RS. It'll be faster than ever on the road and the track. And I also find something really satisfying about a very good sequential gearbox. It's not engaging in the same way as three pedals, but it's tremendous in an entirely different way.
It should also have more power, look for it to be in the neighborhood of 500, moaaaar EXTREME aero mods, and retuned electric steering to hopefully get back some of that hydraulic awesomeness from previous generations.
Look for the RS to appear later this year or early next year.