https://www.youtube.com/watch?v=8csc1BYUpUg
Looks like Mia is back (But will Brian be mentioned?) but also turns out they have another sibling, the John Cena character, now working for Cipher.
Also, like Letty, who "died" in 4 but was shown to be alive in 5 and brought back to the gang in 6, looks like Han somehow survived. The character was originally introduced in Tokyo Drift, but showed up in 4-6 which took place earlier, where he developed a love interest with Giselle (Gal Gadot) who was killed in 6. His death was partially retconned as being somehow caused by Jason Stratham's Shaw in 6 & 7, but now he appears to have survived. Either that or it's his twin brother.