thanks for the response i was kinda confused i understand now.season 1 on steam will have 10 chapters...this is just a demo of steam-season-1 containing 3-4 chapters only.
after season 1 is complete on steam, which should happen sooner than later, they should go back and finish the game (one more chapter and epilogue)...after that season 2 and season 3 on steam (containing from ch11to ch25/26).
hopefully that is clear enough.