There is one part of that email from Tesla that I don't understand, quote:
"If you choose not to upgrade, your car will delivered with the options you configured, without Enhanced Autopilot features."
The way I would interpret that statement is that if you don't select the two new options you would receive your car with the first version of Autopilot.
Which could mean one of two things:
1 - Your car would have the AP V1 hardware and software
2 - Your car would have the AP V2 hardware but the AP V1 software
I wonder which one you would get IF you had not decided to pay more for Enhanced AP?
I think the email made that very clear, you get AP V2 hardware with the AP V1 feature set. (One part of the email said "If you choose not to upgrade, your car will delivered with the options you configured, without Enhanced Autopilot features. Post-delivery upgrades will be subject to a $1,000 surcharge."
i.e. It costs you $2,000 to go to EAP now, or $3,000 after delivery.