The phrase "next frontier" refers to the next area or field that is unexplored or untapped. It is like a new opportunity or challenge that people are excited to dive into and discover. Full definition
The article describes mobile technology as the «next frontier for business development» whose benefits can include new clients as well as firm brand recognition and media attention. (lawfirmmobile.com)
Working with families is the «next frontier in education,» said Newton Mayor Setti Warren. (gse.harvard.edu)
The planets are the obvious next frontiers for human exploration. (discovermagazine.com)