That's what I thought at first because the download screen does not look the same, but it's just a real long download, 500+mbs
This demo is 720mbs
The previews of the 2 other tracks included in this demo are not simple videos, they are the actual tracks in replay mode, so this leads me to believe Daytona and Fuji are included in the 720mb download but are of course undriveable. Many unplayable cars are in the demo as well, so they must be modeled and inside the 720mb download
So 720mbs includes 3 tracks and I'm guessing around 25 different cars.
There isn't a high definition intro video, that is around 100mbs right there
GT:HD - 1 track + 10 cars MINUS intro video = 520mbs
GT5
Demo - 3 tracks + 25 cars = 720mbs
My geuss is the GT5
downloadable game will not exceed 2 GBs