Just look at what Porsche debuted at Geneva this past March: the 911 GT3 RS and the Cayman GT4. Both extreme, and both for the speed enthusiasts. But is it possible for Porsche to take any one of those two models to an even higher level of bonkers? Oh, absolutely, and we now have our first evidence that it might be happening. According to a new report from Autocar, Porsche has just trademarked "GT5," the clearest indication yet that it's up to something kind of mysterious. Why's that?

Because it's so far unknown whether the GT5 moniker will be used for a future production model or, for example, a possible new GT racing class? The 911 GT3, as we all know, also competes in racing form in the FIA Group GT3 class. Thing is, there is currently no GT5 class. So what's Porsche's thinking here? An even more hardcore Cayman? Boxster? Perhaps even an extreme Macan or Cayenne? Heck, we wouldn't even rule out a Panamera GT5. But whatever's going on, Porsche has signaled once again to its competitors that it remains very much at the top of its game.