If you buy a new car now, and don't select eAP, you won't get AP1, and you won't get TACC. You'll still get the AP safety features as they are enabled - collision alerts, emergency braking, and the like, but the car will never steer itself, and the cruise control will be "dumb" - holding a set speed but not reacting to traffic.
(This is the same as what folks who didn't order AP got under AP1 hardware, though AP2 presumably will do slightly better on the safety features eventually.)
There's a lot of discussion about what folks who ordered and paid for AP before eAP came out but refused to pay the extra upgrade price once Tesla announced eAP and delivered their cars with AP2 hardware are getting, but that's beyond the scope of your question I think.