Gran Turismo 5 will pass 10 million lifetime sold in 2013

[Chris Hu]

SunofKratos said:
Only because GT5 need 5 years to make doesnt mean GT 6 will take the same amount of time. Polyphony hired people too, not only Turn 10.

And for the productiosn costs. Most people dont expect next gen to be much more powerful so i dont expect nexgt gen gamesto be so much more expensive to make.

It more like 6 years GT4 was released in Japan on December 28, 2004, GT5 was released on November 24, 2010 in NA and EU.  The average development cycle for each main Forza title has only been two years.  If you want GT6 anytime soon you better hope for a fall launch of the PS4 and hope that they don't release another Prologue.  Also production costs are going up regadless of how much more powerful the next consoles will be.