There are quite a few other contestants in that space, from relative newcomers like McLaren and BMW (well, soon), to rivals like Ferrari and cousins like Lamborghini (even sooner). At least one analyst doesn't think Porsche should be having such thoughts, saying "Development costs for such showcase vehicles are huge. It requires some very creative mathematics to make a plausible business case for such a car." But apparently, said analyst hasn't been paying attention to the creative developments Porsche has applied to the 911 for decades now. This is a company that all but sold out of a $170,000 car that could only be bought in combination with that $845,000 car.
Such a supercar remains but a consideration, so it's a long way from being anything close to real. However, the brand's sales chief did talk about more editions of the Cayman and Boxster, as well as extended-wheelbase and convertible versions of the Panamera "four-door coupe" which would add more runts to Porsche's litter.