Evolution Studios says they are not focusing on competing with Gran Turismo 6:

"We don’t see Gran Turismo as a rival title."

"We focus on the development of DriveClub and what it embodies. It comes back to issuing challenges, it comes back to the community side of things and clubs. It comes back to driving the greatest cars and the greatest roads. They’re our colours, that’s what we focus on, and that’s the message we look to deliver, and I think that resonates with the gaming community."

DriveClub is an upcoming ultra realistic (claimed by the developers to be the most realistic yet) racing game developed by Evolution Studios exclusively for the PS4. It will be released Q4 2013.