I would first put said dealer on the spot by asking which GM Weblog he got his info from, GMInside? How about edmunds, which states (on the aforementioned 4/2) that the G8 coupe may NOT be dead? That's the closest link in a blog covering the intro of the Solstice at NYIAS I've found.
__________________
When more than one friend wants to ride shotgun

No, I
do not work for GM or any subsidiary or supplier.