This rumor comes from Latino Review so take this with a grain of salt. Sources at the site are claiming that we will have a Ghost Rider in the upcoming 4th season of Agents of S.H.I.E.L.D. It won't be Johnny Blaze or Danny Ketch though. It seems they may be using the most recent Ghost Rider, Robbie Reyes from the short lived series which saw the character using a muscle car instead of a motorbike. There's no word on whether the series will delve into his ties to the supernatural or if he'll just be an Inhuman, but hopefully his appearance here doesn't close the door on a return to live-action for the classic version.
A casting call was sent out a few months back looking for the description for the characters that fits Robbie Reyes and his disabled brother in the comics. "A pair of Latino brothers, one of whom is always the most dangerous person in the room, the other paralyzed in a wheelchair." Nothing is confirmed yet but expect some kind of confirmation about it this Saturday during Marvel's panel at SDCC.
Agents of S.H.I.E.L.D. season 4 premieres on the ABC network September 20, 2016.