From Sci-Fi Wire:

Robert Englund, who originated the character of Freddy Krueger in the Nightmare on Elm Street movies, told horror Web site www.pitofhorror.com that talks are underway with Halloween writer/director John Carpenter for a sequel to 2003’s Freddy vs. Jason, with the addition of Halloween’s Michael Myers.

Why stop there? Let’s throw some Cenobites, the Tall Man, Leatherface, and maybe every other horror franchise in there while we’re at it: Everything vs. Everything Else.