The mighty fell 10 years ago, to be honest, when they announced GT5 in 2005 at E3 under "Vision GT", only to have the game come out 5½ years later. In the automotive world, if you delay a car's launch by 5 years, you're dead and gone. In a market like videogames, where everything moves fairly quickly, people lose interest pretty much as quickly.
Meanwhile, we're 3 weeks away from the 9th title in the Forza franchise in pretty much the same time span.
Maybe they've had to take all the VWs out as well and that's why it's delayed?