We can assume that the main cast will return to perform their respective roles, but no official announcement is yet made. It is heard that Skeet Ulrich and Marisol Nichols would not be returning to the show as FP Jones and Hermione Lodge, respectively in Season 5. We can also expect KJ Apa as Archie Andrews, Lili Reinhart, as Betty Cooper, and Camila Mendes as Veronica Lodge.
Nothing is known about the plotline of season-5, we will get a better understanding of the storyline of next season, only after the conclusion of season 4. Anyway, some clues about the plot of next season, has come out.
Some cast members have posted it on their social media handles that season 5 is going to take a time leap of four to five years. This will solve the complicated problems of the college.Also we can assume that this twist in Riverdale will bring all together back after parting from school, and this would make the show all the more fascinating. Let the show come out at the earliest as we just cannot wait any longer.