I think people are assuming it'll be Ghost Rider when actually they're teasing a character called Hellfire, who was on the original Secret Warriors (the storyline they're doing in AoS) and was a pyrotechnic who used a chain. He just happened to be a descendant of the Phantom Rider (the original Ghost Rider)
What they might do is simply combine that character with Robbie Reyes. I don't think they have the budget to portray a Ghost Rider of any kind in all their glory.