Don't sweat it until time to order, If they pull this BS, tell them you want to talk to the dealership owner, and that you are going to tweet Duncan Aldred, and Mary Barra, and stir up lots of trouble if they gouge you 1 penny... That should make them think twice...I'm sure plenty already know but just wanted to bring it to attention to those that don't. Called my dealer today checking on any updates and also asked to make sure they would still be selling to me at msrp... he replied with " hmm I will have to verify and check on this.i can't say ". I talked with a Manager a year ago and he told me they would not but I didn't get it in writing. That was a year ago and obviously things have changed . Yes I think most know that gm said they encouraged dealers to not mark them up but legally they can not enforce that.
I called concierge after the conversation with the salesman this morning. My status was still the same but concierge said they would look for it to change soon and any day now.
I asked about if I had a disagreement with the dealer or wasn't pleased with how the dealer was acting , could I change my reservation to another dealer? The gentleman put me on hold to verify with a higher up and came back and said yes that the reservation could be swapped if I wasn't pleased or requested to do so...
Long story short if you have a rogue dealer who wants to add markup to your reservation... tell them to go pound sand! You have options !
If that does not work, tell them you want to be in a good mood when you fill out the dealership satisfaction survey, and if you get gouged, you will return the favor on that satisfaction survey.