One of the things that WotC did this year was the Game Train. A couple of WotC employees rode the train from Seattle to Indy for GenCon. They played in a Dark Sun/Essentials adventure on the way, and Trevor Kidd just posted on a blog on the WotC website some information about the characters and the adventure.
A closer look at the Characters of Game Train
We find out about an ardent power, Mantel of Impulsive (helps allies that get targeted by opportunity attacks); the knight Battle Guardian power (allows you to make an OA against a creature that shifts or attacks someone other than you when the attacking/shifting creature is in your knight's aura); as well as a human racial power, heroic effect (gives a bonus to failed attack or saving throws); a knight stance called defend the line that slows people you hit when you are in the stance; and a thief feat, Unbalancing trick, that knocks people prone when you hit with a melee basic attack.
A closer look at the Characters of Game Train
We find out about an ardent power, Mantel of Impulsive (helps allies that get targeted by opportunity attacks); the knight Battle Guardian power (allows you to make an OA against a creature that shifts or attacks someone other than you when the attacking/shifting creature is in your knight's aura); as well as a human racial power, heroic effect (gives a bonus to failed attack or saving throws); a knight stance called defend the line that slows people you hit when you are in the stance; and a thief feat, Unbalancing trick, that knocks people prone when you hit with a melee basic attack.