The US SSL, US S, CN SSL, and CN S lists sum to 1,200. The SSL list is not separate from the S list.
On the P and R side, there will be upgrades to S, and some drop-outs. Further, some number of P and R reservation holders are going to have delayed delivery because of their preference for a smaller battery pack, gray interior, Sunset Red exterior, or standard suspension. Simply put, the cars aren't going to be delivered in strict reservation # sequence. I'm still hoping for a Halloween delivery at P1635, but I'm thinking mid-November is more likely (85kWh pack, tan interior, green or blue paint, air suspension).