My dealer at Porsche of Orlando inquired specifically and was told that no S/R delete option is available for the GT3. I asked him to find out about the RS, where details are still sketchy. He did say interior trim options for the RS will include black partila leather, black full leather, and grey full leather.
production numbers that were quoted are 700 for the GT3 and 350 for the RS, for what it's worth.