This may be a little obvious but I have a strong feeling Chloe, Nino, and Alya will be given their respective miraculous at the end of season 2 (le paon battle?)/during season 3 when a big fight happens. I feel like Master Fu will sense the need and this will be when they finally become part of the regular cast of heroes occurs I hope? Probably cliche but maybe when Marinette and Adrien are caught, those three will come to the rescue and then it'll be a idetity reveal or something like that lol?