First you have to realize Tesla is in business to make money. There is very little profit on a base Model 3. On the other hand there will be considerable profit margin on a highly optioned Model 3. It only makes financial sense to order delivery of the Model 3's by which cars will bring you most profit. Even with the Model S and Model X they manufactured the highly optioned cars first. There are people who placed a reservation for a Model X over four years ago but just recently got theirs because it was only a $85k version not the $160k fully optioned car. It is not like Tesla has hid that this was their plan as Elon meantioned it during the reveal and again during a quarterly call.
With regards to the AP2 pricing. The cost to Tesla for hardware for AP2 is minimal. Probably a few hundred dollars. This is why it is easier for Tesla to install it during manufacturing and then offer it to those who want it as an over the air upgrade. It is much cheaper to install the parts by robot on the assembly line. It would be prohibitively expensive to go back and retrofit them with this functionality after the fact. The $8k is the cost of hardware, software along with the cost of R&D. Ultimately you may find the offset in insurance costs may help pay for this option over the lifetime of the vehicle.
I keep seeing where people say they hope the cost comes in below $35k. I think the chances are the price will be higher than $35k than they are prices will be under $35k. Elon has committed to $35k and it is highly likely this is what the base model will cost. I think there will be very few people who will buy a Model 3 with just the base options.
Paul Carter who has been contributing to the TMC forum since inception has put together a good spreadsheet which goes over his estimate to the cost of the various options for the Model 3. I find his estimates to be very concervative and if anything the costs will probably be slightly higher. Also don't forget when you look at the total cost to add $1,200 as this is what Tesla charges as the destination and docs charge on for all cars no matter the cost along with whatever your state charges for sales tax on new cars. My state charges 6% or $2,400 on a $40k car, $4,800 on a $80k car.
Here is a link to Paul's pricing thread:
Model 3 Average Selling Price Predictions
Finally if you have not already created an account on
http://Model3Tracker.info and input what options you plan to purchase please do so. Also, if you haven't been out there lately some of the options have changed so please update your information. Finally, City and State are now required fields.