A new Eye on Dark Sun article by Rodney Thompson is up today:
In the deserts of Athas, mirages are as uncommon as the travelers that witness them. Images that appear are often lures into greater danger, generated by malicious creatures or simply the byproduct of a ravaged world. Even so, it is rare for two people to have the same vision. The lone exception to this rule is the Ghost Caravan, which seems as though it could not be real . . . yet is a phenomenon that has been reported too many times to be dismissed as a mere trick of the mind.
Get it here. (DDI subscription required)