There could be a few kids from the children/siblings of students in the earlier series. There's lots of opportunity here.
- Izzie Charles (Chlo and Donte's daughter) would be 12/13 now. She may also have a sibling.
- Lauren Drummond seems to be free at the moment and I expect she will return as Mika. I think Thomas Payne might be living in America so they will have to recast for a Brett return. Brett and Mika could've easily had a child within the couple of years after they left, although I imagine they would've been born after Chlo left or the baby would've been mentioned. Mika and Brett's child could be in year 7/8 now.
- Cheryl Bryant (Janeece's daughter) would be around 12.
- Prince Kelly (Sam, Denzil and Earl's little brother) would be 15/16/17. I wonder if the school will still have a 6th form.
- Dannielle Harker could return as a businesswoman with a couple of kids, one in primary school and the other starting at WR. I's watching the original run on Iplayer at the moment and am loving Danielle.
- Kim has a son (now 12/13) so I imagine he will appear in the new series. I know Kim 'adopted' another child in Rwanda but I think she was taken back there by her biological father.