Sony has released some teaser footage of Nicolas Cage in character as Ghost Rider. Churn has previously shown images of his motorcycle, complete with flame effects.
From looking at the footage, I'm fairly impressed so far. I'm guessing one of the problems the film makers are grappling with is what to do about Ghost Rider's eyes. Since he does have a flaming skull, most artists have kept his eye sockets empty. This makes him a very mysterious and ominous figure.
And this is where the worlds of Comics and Movies collide. Just like in the case of Spider-Man having organic web-shooters in the movie, when for almost 40 years they were inventions of his own design, derivations from the source material will be made.
Hollywood is usually very reluctant to hide the eyes of actors. Even in special effects laden projects, they argue that if you can't tell who the actor is under the makeup/latex/CGI, then hiring that 'name' actor is kind of pointless.
While it's hard to tell from those few seconds of film, I would expect there to be some way to tell that Nic Cage is under those digital effects.