Episode Movies ??

Hello Everybody, New Member here.

There´s a few Things I need to get off my chest and hopefully someone in here can help me "calm Down"

As with so many other SW fan I´m really hyped for TFA however recently I read that there were these 3 actresses on the shortlist to play the Female lead in Episode 8 and that got my wondering... does this mean that the Whole Rey, Finn and Poe storyline will conclude in Episode 7 or are they just adding more leads to the cast since everyone is talking "new story" in Episode 8.. Now I might be at Little "out of the loop" in regards to knowing every bit of info concerning TFA and the Whole concept of these new trilogy movies, but givin that leaked and spoiler info are pretty much common these days I´ve tried to avoid it as much as possible.
I´m just hoping we get Rey, Finn and Poe for more than just one movie..

well that was my little first post, hope someone can help me answer what the F is going to happing with these "chapter" movies as they´re called

Untill next time..