The best part of the new edition of Dark Sun is a reboot to the time just after the Death of Kalak in Tyr. Tyr becomes the first free city in the age of the Sorcerer Kings and has to fear attack from outside and treachery from within. This is probably the best time for gaming in the world since it is undergoing major change but without all the silliness you got in the Dark Sun Revision after the Prism Pentad cycle is complete. The Sorcerer Kings are still the dominate presence in the world and life for people who do not follow their rules can quickly get very deadly especially in their City States.
The only limiting part of this timeline point is that characters who want to become real movers and shakers in a city state only really have an option of this in Tyr as opposed to later where more states have lost their nearly invinciable Sorcerer Kings. We had a great campaign based out of Balic after Androponis's disappearence since less stuff was written about the city. The GM had more freedom to develop the location and the factions fighting for control.