Glad I read this. Re-checked the Brochure and On-line seletion for Canada as to the Platinum I ordered on Aug 31/12.
A) Adaptive Cruise Control
Brochure reads Driver Assistance Package as Standard and also under Cruise Control but there is an elevated little "1" listed next to it which means "Interim Availability". whatever that means. LOL. The same applies for the "Standard" Automatic Collision Preparation and Standard Automatic Front and Rear Braking items listed separately and my sales person actually initialled this in the brochure as being part of what I ordered as I was concered as to the "1" indication. Those latter two items were also listed as part of the Driver Assistance Package.
On the On-line selection (at least NOW), the basic Platinum doesn't even list (basic) Cruise Control, which the brochure lists as Standard for XTS and Luxury, but NOW has an "option" for a CDN$2.495 Driver Assistance Package, which when selected then shows all three items. Thus now it seems you either get only all three as an option or none, and, based on the listing, not even the (basic) cruise control. Must have overlooked that in August or, most likely as I really checked for any available option, it was not an optional item at that time.
B) Twilight Sentinel
Brochure reads under Lights among other lines "Daytime running lights with automatic light control and Twilight Sentinel" as Standard for ALL models. No extra qualifications notes here.
On the On-line selection it is now not listed at all. Don't know what it was in August! Bummer!!!
I guess I have to discuss with the dealer the item (A) issue. Looks to me as a subsequent "increase in price". Whatever, given I have not yet received the car, (now has a "tentative" production date for the week of Jan 7/13.) there should be no reason for the dealer not to be able to make sure my car will have it, whether or not I would have to now pay extra. With his initial in the brochure I should not have to pay extra. I seem to be out of luck as to "B". Trust it has at least automatic light control which is even available on the smallest GM car now.