Sony explains why Gran Turismo 6 is debuting on PS3, not PS4

[badgenome]

"You had GT1 and GT2 on PS One; GT3 and GT4 on PS2; then there's GT5 on PS3 and a space next to it."

This is a terrible reason. "We decided to put our biggest IP on our old platform instead of using it to push our new one because we have a crippling obsessive-compulsive disorder."