I began my evening tonight by watching the first 100 minutes of WYATT EARP. I've always been a fan of the film, and I'm enjoying the new high definition transfer quite a lot. When I finish, I'll put in the SD to do some A/B comparisons. While the Blu-ray looks very nice, I wouldn't say it's as dimensional as newer transfers that I've seen lately, but it is better than others.
The supplements are exactly the same as those on the SD version. In fact, they've just ported them over from the SD. None of the supplements are in HD at all.
The sound isn't an upgrade either. Standard Dolby Digital 5.1 (though the bitrate for it may be high than on the SD disc. I'll have to check that later.)