In a report from Bob Gritzinger on July 6, 2005 on AutoWeek.com, he gave us just a little more information about the prospect of a turbo.
 
"Meanwhile, with the 2006 Pontiac Solstice roadster due this fall, we’re already getting word that the hotted-up version is nearing completion. Though General Motors tested both supercharged and turbocharged versions of the 2.0-liter Ecotec four-cylinder, our spies tell us the General has settled on an intercooled turbo to push the base Solstice engine to 250 hp.

We’ll see the high-performance turbo-powered Solstice GXP, with dual exhaust and a six-speed manual tranny, on sale next year as a 2007 model."

Keep your fingers crossed.