Supposedly Cronenberg is in talks to write and even direct this new version, despite the fact he has publicly said he did not want any involvement in a remake. Sounds rather odd to me, and personally I feel The Fly is a pretty perfect film, and I would actually welcome a sequel by Cronenberg rather then a remake.
Cronenberg is easily one of my all time favourite directors, and I will closely follow this as it developes. I do recall a few years ago Nic Cage was interested in playing Seth Brundle in a remake, talk about bad casting. I don't think this would suit him at all, I am actually not sure who I would like to see in the role. Jeff Goldblum was perfect in the 1986 version, and that is going to be extremely hard to top.