the thing that improved the most or changed, whatever u wanna say, is the physics in the new gran turisimo demo vs previous gran turisimos. i notice with the evolution 4 that there is, of course understeer, and when accelerating out of the corner u can oversteer, if not careful. it made the evo 4 fun to drive. this is with all the traction control and driver aids off. with the previous gts it was a little harder to do. u would just get understeer usually. driving feels more natural in the game. even though i never driven an evo 4 or any evos.
the graphics to me have improved moderately for the ps3. would i get a ps3? for this game i would. i'm a gt fanatic so my answer is biased. if gt5 is released on xbox360 then i would get a xbox360. blueray isnt something i need.
sinced i played the demo, i havent felt the same playing gt4.
all i have to say is ferrari 599 GTB Fiorano ftw.