If Apple decides to make a notebook form iOS device, the iBook name is waiting (the last iBook was in 2006). Aside from the iMac, the name fits perfectly with the MacBook, iPhone, and iPad naming conventions.
iPads already support trackpad like cursor control (and I guess some iPhones do too?). And iPad Pros seem focused on keyboard support. So offering a better keyboard and a trackpad experience is not a big jump.
I wonder what will be the catalyst (nominal or real) for something like this. Office is already available. Screen size is already there. Maybe an issue with the ergonomics of touch on a vertical screen?