Hawk announced the new PlayStation 4 skateboarding title during Sony's CES keynote speech.
As exciting as that announcement might be, there are no additional details about the game, not even a title. We know it will release this year and that it will come to PlayStation 4. There was no word on whether it will be exclusive to PS4, leaving open the possibility that Tony Hawk might make its way to other systems. Heck, we don't even know if it will be a downloadable or physical release.
Some speculate that Activision and Sony have cut a marketing deal reminiscent of Destiny's Sony exclusive advertising. Of course, it is a bit too soon to jump to any conclusions with the limited information available. It's enough for now to know that Tony Hawk 2015 exists.