Will GT4 have any tools in replay mode to allow you to analyze your line through corners etc? If I remember correctly, in GT3, the analyze function only showed a replay of each corner, with the indicators of when you pushed the gas, and when you pushed the break... It'd be nice to see a top down replay with your line drawn in with indications of when you were breaking, and when you were accelerating... Possibly with an overlay of the "ideal line" so you can see what you're doing differently etc...