Don't know if this has been posted yet, but as of 10/3 in dealerworld, the steel/sand interior is now available to order with Aggressive and Envious.
GM DEALERWORLD said:Distribution Updates
Updates for Solstice
Week of 10/3/2005
Effective 10/3/2005, the following changes will be made to the Vehicle Order Guide:
Color and Trim section-Exterior colors (38U) Envious (Emerald Green Metallic) and (74U) Aggressive (Victory Red), changed symbols from "--" to "A" with interior color (312) Steel/Sand.