Will Smith?????!!! God help us!
Sorry, I simply can't stand Hollywood's tendency to get someone completely wrong for a role.
Matheson also wrote a little book titled Bid Time Return, which he then turned into a screenplay for a little movie called Somewhere in Time (he even had a cameo in the film -- look for the tourist wearing the white panama). I always found that one an odd book in some ways; at times very lyrical, but unusually subdued for Matheson, at least until the turning point; then, as usual, he put his character through sheer, unmitigated hell, even if a much quieter, more personal sort than Scott Carey or Richard Neville.
A warning about Hell House, for anyone who hasn't, but is interested in reading it: it's strongly linked to Shirley Jackson's The Haunting of Hill House and even more strongly, perhaps, to the Robert Wise film version, The Haunting (1962); almost a parallel text, in some ways, but much, much more savage. In some ways, the film version of Hell House, The Legend of Hell House, almost came full circle, being closer in feel to Jackson's novel. (I hear they're also considering refilming this one; done properly, it could be one hell of a roller-coaster ride; but I've little faith in Hollywood where that's concerned). And for those used to Matheson's older pieces, Hell House is strong medicine, especially the bits with Florence Tanner. Good, but read with caution, would be my advice.