Dwayne the Rock Johnson originally didn't want to return to the series due to his real life feud with Vin Diesel. Vin Diesel stated, "It was no easy task, because so much has been created in this universe." He also stated, "To tie up all these storylines, this character needed to come back into the mythology."
Cody Walker is rumored to portray his brother Paul Walker in CGI as Brian O'Conner in this movie.
The series may end in a 2 part finale instead of 3.
Vin Diesel wants Robert Downey Jr. to portray the 'antithesis' of Dominic Toretto in this film.
This would be the final movie of the series.