What exactly does Diversity mean today in schools?

"today, notions of diversity are broader and more complex. Not only are the students more likely to be multiractial or mulitethnic but they are also likely to be diverse along linguistic, religious, ability, and economic lines that matter in today's schools"
This is different from the olden days, teachers today have to teach children who represent an incredible range of diveristy. Not only are student of different races and ethnicities but there are students whose parents are incarcerated or drug-addicted, whose parents have never held a steady job. These issues can pose problems with dealing with these children. Children are now labeled with varies disabilites and have to struggle with these lables. Diverisity is not just a race issue anymore. Children come into classrooms with money issues also, you can have an extremely rich, and on the other end extremely poor child in the same room. It will be the teachers responsiblity to make sure that both of these students are treated equally and fairly when at this mutal place. That is what I think Ladson-Billings is trying to say when talking about diversity today. That it is much different then in the past, yet we still need to treat all these issues equally and fairly so that all students feel free and welcome.