Rough translation, JGAFers please correct me or add anything that I have missed.
http://www.famitsu.com/interview/article/2007/08/01/668,1185973654,76199,0,0.html
Key points from the interview:
# The game that could be
released on 10/24/2007 to coincide with the 2007 Tokyo Motor Show. Being that this years Tokyo Motor Show will be "revolutionary" for Japanese automakers debuting their brand new sports cars.
# Various new online features will be announced and the game will be playable at the Leipzig show this month
#
GT:HD Concept will be removed from the PSN network when Prologue is released [boo, I like this game]
# GT Prolouge will be Home compatible
# There will be a "My Page" screen selectable from the title. Having given the online race component a lot of thought, the "My Page" will store your friends list, even calender, ranking etc. The online component will try to build an online community like social networking sites like "My Space", "Mixi" (Japanese MySpace equivalent)
# While the game is called "Grand Turisimo Prologue" it will be less like an arcade mode but closer to a
simplified version of "Grand Turismo Mode" in the other GT games; making money, buying cars, etc.
# It will be a Grand Turismo "World".
In the final version they would like to have people be able to walk around a town and look at cars. They will creating each detail of the city as well as the car. Other then Tokyo they will have scenic views like
natural environments as well.
# GT
rologue will have 40 cars and 4 race tracks (8 different configurations). Including tracks not seen before.
# When asked about
downloadable content, he responds "now right now, but likely later on". When asked if the "Grand Turismo Award" winners from the 2006 SEMA shown in Las Vegas will be available; tuned 1960 Corvette and HKS CT230R Yamauchi responds, "I think one of the them. "
# Cockpit view will be available. If you are using the steering wheel you can
look around in the cockpit using the d-pad[most people know this from playing gt4, but it's apparently "new"]. For instance, it the Ferrari F430 you can appreciate the shine off the carbon fiber and the quality of the black leather seats. You can tell the quality difference in the leather of the Ferrari versus other cars.
# In Grand Turismo 5
you will be able to fully customize the interior.
# Depending on which car you drive
your clothing will be different. Different helmet designs and other details that relate to the car manufacter.