Hmmm good question!
They re-aired the premiere episode on Saturday.
Last year USA (I THINK it was USA anyway!) re-ran the episodes on the following Monday (the day before that weeks' new episode) at 7:00 pm (PST). I checked the schedule on Monday, though, and didn't see it listed.
Maybe they think we all have TiVo now and don't have to worry about reruns... bleagh.
I've noted the following differences between this season and last season (feel free to add more!)
1) Last year there were a few "lightweights" in the mix...this year everyone is what I would call obese to morbidly obese (lightest at 217 lbs I think?)
2) Instead of teams chosen at will, they're split up between men and women (red and blue, respectively).
3) Instead of going by pounds lost, the 'biggest loser team' for each episode is judged on percentage of weight loss
4) I'm not sure on this but this season, the team member who lost the most weight in the team that 'lost' the weigh-in is now left out of the elimination (pretty sure though, because I recall that last season Aaron lost the most weight the week he was eliminated).
5) Last year Jillian's team was Eat Less and Bob's was Eat More...this year they're counting calories (varied for male and female)
Feel free to add other diffs you might notice...