The Terra page kinda implies it. Under exterior features —> retractable rear window, it says “roof open”. Not sure of that necessarily means cabana roof, but some sort of openable roof
Would be a good option if they can pull it off. From what I remember the cybertruck was originally planned to have a bench seat option but crash/airbag regs nixed it. Something about middle passenger hitting their head on the screen in a front end collision. Maybe there was more it though