After the success of Furious 7, Universal Studios made it clear that a Furious 8 film would be in the pipeline. We now understand that Dwayne "The Rock" Johnson will make an appearance in the next film, but it is not certain in what capacity.
A Furious 8 movie in the next year or two shouldn't be a surprise since Furious 7 managed to become the fastest film to earn $1 billion at the box office. To be more precise, Furious 7 did this in the first 17 days, and we are almost sure that if it weren't for Avengers: Age of Ultron coming out on May 1, 2015, Furious 7 could have a chance of hitting the $2 billion mark.
In an interview with MTV, Johnson stated that Furious 8 could be set in New York, but since he's not 100 percent sure, we might have to wait for official confirmation from Universal Studios.