Very cool.
4e DarkSun keeps sounding better and better. I like the Dragon King epic destiny approach, and I have to wonder if there will also be an Avangion (or however you spell it) ED. I'm glad they made thri-kreen balanced with other races- in 2e, there wasn't much reason NOT to play one.
I do wish they had touched on a few other things, to wit:
-Is metal as rare as it was in the 2e DS stuff? If so, what are the mechanical effects of using bone, wood, etc. weapons?
-Is the environment as deadly? Will there be "dehydration" encounters that can actually kill the pcs?
-What about elemental clerics? Are they going to be absent, or will they be from PH 4 or whenever they come out with the Elemental power source?