Gator,
Your problem might be the White Diamond Tricoat. We originally ordered one on May 2nd but then were told that even though they 'accepted' the order, they weren't actually going to put it in the queue, if you will, because of a delay on the White Diamond paint. So they couldn't tell me when they would even start building special order white diamond paint cars, much less how long it would take to build. The dealer had actually previously ordered a white diamond with the options close enough to ours that came in and we ended up buying that when it came in since (by May 11th, 9 days later) no one had any idea how long the build would take, or when they'd even start. As a matter of fact, check this link - it's not a GM link, but it does show the White Diamond on hold.
https://www.wheels.com/fleet/reference/assembly/html/assembly_lines.asp
Your order sounds like it was in the exact same status mine was, I would call your dealer Tuesday morning and tell them that you heard there was a production delay/hold on white diamond and ask him to give you a more complete answer.
Good luck and let us know!
Don