heard a rumor or got some gossip?
I suggest you wait to see when the show is launched and they announce more news about how long the show is on for. Often the shows website will add a tab - auditions- which will give the information you need. The children will be under maximum 6 month contracts so yes they will be looking for more children if the show runs longer than 6 months.
I'm swanning around trying to get the hang of all this! Thanks for your help!