thats a very good question i belive every one is wondering. i belive they might show the younger virsion of them when they were kids like mia a doms mom and dad maybe brian and romans life befor every thing idk but i belive 8 would be like that if they think about it 

there has been no talk about a fast and furious 8 or 9, as it was quite hard for the producers and cast to make number 7 without paul walker. We will just have to wait and see. they may do a story on dom and lettie tho. 

I had an idea that for Fast 8 that Carter Verone was finally back and was located in New York, so Dom and his crew had to go after him under Mr. Nobody's operation, and Monica from 2F2F would return. 

For Fast 9, I had an idea that the kingpin of a mob in Detroit killed Dom's grandfather, so Dom takes the entire crew to Detroit to take down the kingpin.

They should make it were Dom and Letty are having a child.....