I think that the round
I think that the round steering wheel will be an option. Most pics that show the round wheel are on prototype cars. I have a friend who has a Raven Model S Performance, and he said that when his car first shipped, not all of the performance modes were shown initially, and that came with a later software update. Plus of course the even later update came with the Cheetah stance and an extra 50HP, for free. Given that the new, tri-motor, Plaid chassis will have over 1,000 HP, it doesn't seem like an amazing feat to shave off 5/10ths of a second off of the current 0-60 time. I really do not think that the structural battery pack or 4680 batteries will be in the regular Plaid models of the Model S and Model X. Otherwise who would pay $30K more, and wait several more months for the Plaid+ model. I cannot imaging how Tesla would fit in the extra 2 seats facing forward with any leg/foot room, so I think that it will be just like the previous back seats. I think that Tesla's discussion about the details of the new Model S, including performance and modes, will be only after the cars get out to new owner's hands, which I am hoping will happen before April 1st.