It’s known that the whole living paycheck-to-paycheck aspect will remain intact, and that not only will the lottery-winning season get retconned, but Dan’s death by heart attack will also be reversed to get John Goodman back.
But that’s just great news, not anything about new people, so we really need some casting news to help us along.
It’s harder to speculate on what kind of legitimately all-new characters would show up on Roseanne, since we don’t really know where any of the characters are in their lives.
Although perhaps former Becky Sarah Chalke will take on one of those roles,as she’s confirmed to return not as Becky, since original actress Lecy Goranson is also returning.