You are wrong though, the layout in the Academy demo is still correct, the MotoGP drives the track in the opposite direction plus a couple of more corners, the F1 layout is exactly like in the GT5 demo.
EDIT: The only thing thats different in iRacing is the chicane at the end and i dont know if they ever changed it.
2:09 in this video.
http://www.youtube.com/watch?v=LTv9TgOC4l8
edit: not trying to say the GT5 demo one isnt correct, it is for the old F1 track which is no longer there. And iRacing is correct for the current road course that is at IMS. This is talking about 7,8,9 on the moto gp track and 8,9,10 on the old F1 track.