Ducati generally sells one specific to each model. No reason for me to believe it will be any different for the SS, although early owners might get a bike before it is available.....lets hope not. Although Ducati designs one for each bike, I did not care for the one they offered for my 1200R so I had a tank protector made and installed by one of those clear bra installers. Cost was close to a factory protector and it was virtually invisible.
Strongly advise to avoid the clear protectors. They require a 100% perfect installation to avoid showing any bubbles or adhesion defects. Most people installing one will initially gently lay it in place, anticipating they may have to make slight adjustments. With a clear one, those slight adjustments will cause adhesion defects which become permanently visible. The non-clear ones will hide those defects.
Also beware of those generic ones from the interweb. Their material and design quality is inconsistent with a Ducati.
Just monitor the Ducati web site accessory page for the SS and I'll bet a protector listing will appear before deliveries commence.