I just noticed it earlier this week -- the only reason I noticed it was the site was reporting two different durations for the same flight -- confirmed Y SYD-SFO was showing as 14:45; waitlisted J SYD-SFO on same flight duration shown as 13:45 two rows down on the same page.

Asked a friend who has some "under the hood" knowledge about what's going on and also connections was going to report it through the slightly-outside-of-appropriate channels.

A flight attendant friend suggested that it's really only "perceived duration" -- i.e. that the flight feels an hour longer in coach than it does BF which probably isn't too far off...