At this point I can't say much about exactly how we addressed each of these elements, other than to say that yes, you're going to find all of these classic trappings of the Dark Sun world (and many more) in the new Campaign Guide. One of the things that used to bug me about the old Dark Sun set was that you basically threw out the 2e Player's Handbook and substituted the Dark Sun Rulebook for almost all of your character generation. This time around, a lot more of your Player's Handbook (and PH 2 and PH 3) are still going to be relevant, but just about any "core" character you build should still find plenty of Athasian trappings. Sure, you might be a dragonborn fighter, but we've got ways to make that guy feel like he's just as appropriate in the setting as your thri-kreen ranger or mul gladiator. I'll tell you more when I can!
This is a companion discussion topic for the original entry at http://athas.org/articles/dark-sun-sprint