I just bought a new car (for wife, not me, unfortunately). It happened to be a Ford.
Picking was slim. There was no negotiation. If you wanted something that wasn't on the lot - be prepared for months-long custom order process. Cars on the lot were turning around in less than a week. Every car had an obscene dealer markup, and nothing was under sticker.
On the bright side - they took our trade in, sight unseen, at KBB (I certainly could have got more private sale, but I hate the process, so glad to be done with it even if it cost some money). Wife did find something she loved, and it wasn't outrageous. I do know the salesman though and buy our fleet trucks through him, so he got the obscene dealer markup pulled off for me. I wouldn't call it a great deal, but I don't feel like I got bent over dry in broad daylight.
If I were in queue for something with a long backorder, I'd probably agree to taking early delivery with the promise that the chip would get added in at the dealership when it became available - provided the warranty for said non-working items also extended out from the date the chip was installed. If I were just browsing on the lot, unless it was urgent I think I'd just keep browsing unless the discount was significant (and right now, I'm not convinced it would be)