The GT Spirit article here:
mentions that August Acheitner (the head of the 911 model) has said that the decision on the 991 GT2
“has not been made”
“There are reasons inside the company, and to write today that there will be a GT2 in the future would not be correct.”
Reasons for this include:
Achleitner said, “If you take a look at today’s Turbo S and the performance this car produces . . . you cut away the front-wheel drive for the GT2, but the car loses traction.”
This sounds to me like either 1) marketing hype to create some tension before the car's announced or 2) they genuinely haven't decided yet.
Fingers crossed it'll get into production, even though it will probably be 4wd, PDK, rear wheel steer etc etc.