As I say in the past, if you can't have the full game, at least a demo. To me, these demos are there because of perhaps two reasons. The first of which is because of such anticipation for such a game. The second reason would be because PD wanted to maybe have PS2 terminals equipped with manufacturer-specific copies of GT4. We've seen that with Toyota and BMW already this year and maybe even last year. But be assured that there will be a demo for GT4 even if it's a half-assed demo of GT4. I don't care if it has a time limit to it. Like I seen old pictures of GT3, and in the HUD, I seen a time limit. If we have that for GT4 as well, I may not be surprised.
So I think there will be a demo of GT4. You just cannot have a highly-anticipated game without a sort of demo. Otherwise, how can you be sure the game will be a success? First impressions are key, you know. Not only is that helpful for first dates, but also for video games. So keep your eyes peeled for that little demo bundled onto a disk.