A few bits about Paris additionnal sports in today's l'Equipe.
5 sports max, IOC is pushing for less
Domestic popularity is not a priority anymore
First list will be sent by Paris 2024 next month (no more sports could be added after that), will be released during IOC next session (June).
Only ~10 sports really stand a chance : The five from Tokyo, wakeboarding, squash, wushu, bowling, pétanque and billard
They also confirm that additional sports will have to fit with the Paris 2024 venues map and that the additional sports quotas will have to fit under the 10 500 overall athletes quotas (Baseball beeing )