We know from the finale of the third season that teenagers flee the island on a boat they have repaired. In the last seconds of the episode, it turns out that one of the dinosaurs is also on board. The trailer for the upcoming series suggests that the heroes will eventually end up on another island, where even more serious threats will await.
The creators were supposed to end the story in the third season, but the great popularity of the series prompted them to extend the script. We do not know if we will get the ending of the story in the next few episodes, or if the story will be written for one more, fifth season. We’ll find out on December 12th.