Thought I would post my group on here. Would like feedback on things that might help produce some results. Characters are most likely going to change every other game session, it is Dark Sun and death will come!!! All characters are 1st lvl.
Rakllel - Revenant Assassion - Past life was an elf. This guy is actually an elf still for another game session. He won't get to be a revenant until Kalak tries to up he dragon status. Part of his back story is that he is an assassin for Kalak and a ritual went wrong but no one knows it and once Kalak starts sucking life out, this guy becomes a revenant. Doing the unkillable build but doing elf instead of dwarf. Just modify some of the feats and it is pretty much the same build.
Theirastra - Eladrin Swordmage. She is trying to get into the Veiled Alliance. Currently trying to pass as an elf to get enough money to buy some bribes. Wants to try to help make Athas a green planet again. Doing the Feysword build. I know they nerf Slashing Wave but still looks fun to jump around the battle field. Besides running is always a good option in Dark Sun and teleport can help that out.
Gauthak - Goliath/Half-Giant Warlock Templar theme. This guy hasn't come up with a back ground yet. He wanted to make a Warlock that is off of Con. Walking target if you ask me. He took the Sorcerer King Pact and hopefully won't defile...to much. He is pretty squishy but 32 hp, the most in the party, he can take at least 1 or 2 hits before dropping.
Half-elf Warlord. Not much know about this character yet, haven't peeked at his sheet. 
This guy is used to striker types so he is delving into new territories. All I know is he is a tactlord for now. Hope he has decent powers.
As far as tollplaying goes you got a nice diverse group. I find it cool that your Warlock has more HP than your defender. Two strikers, a defender and a Leader is pretty good. My own group almost wound up with two strikers and two defender lets just say they were in need of heals pretty bad.
Is that the DDI assassin or Essentials'? The latter reads as a 2e-style Dark Sun bard.
Using the DDI assassin. Haven't messed with essentials. If I remember correctly, the bard in Dark Sun was a person you didn't mess with. Never thought of that, might be a good hook later on, if he last that long.
The plan is that he turns into a Revenant during the Kalak ritual. Not sure how the DM wants to bring that to plan, but that is how he starts down his undead path.
As long as we keep the warlock alive, he hasn't gotten the point that not everyone in Dark Sun like the run and smash method, we should do ok.