MTV ran a small interview recently with director Francis Lawrence, who was responble for the films I Am Legend as well as Constantine.
The director talked briefly to MTV about both movies, and when asked which was more likely to happen he bacally said that he would love to do another Constantine film because of the cult following, and if they could figure out how to do a sequel he wanted it to be a more dark, scary movie, with a hard R rating, not like the first one which was PG-13. He was then asked about the I Am Legend prequel, which he quickly had this to say, "No, I don't think thats every gonna happen."
So, I guess for now we can hope for two things:
1)
That the long over due prequel for I Am Legend gets made, by Francis Lawerence.
2)
If a sequel to Constantine does get made, then it better be badass and not suck like the first one did.