My source is NOT the ABC extended broadcast (this is from one of the other non-extended HD versions floating on the net) but there is no way that this HD version was made from Super35: No one transferring the film could be so stupid and crop this much unless they had to.
Widescreen DVD:
HD (resized to match DVD):
View the full sized 720p version here if you don't believe me:
http://img53.imageshack.us/img53/7304/hp3hdck5.jpg
I'm now terrified about what a future BluRay/HDDVD release might look like since they love to go full 16x9 rather than preserving the OAR.