The second biggest Sony franchise will have it's third game in March 2010 so yeah the last thing Sony would want would be the two biggest fighting each other for sales. GT5 is pretty much confirmed to be a monster in terms of quality especially with nascar (yuck) and WRC.
I don't actually think we will see another GT game this generation for consoles since this one has plenty. The Portable GT game has more cars and tracks than HD console games which is a pretty big kick in the teeth.
Sales wise I honestly expect PS3 sales to explode in EU and Japan with FFXIII, GT5 and that Slim PS3 on the way. NA is a lost cause though. I assume the GT5 release date will come at that new EU gaming event which has taken over Leipzig or TGS at latest. Time to push this game out the door now.
