Goblet of Fire will be in two parts?

[Elizabeth Catherine]

Hi all,
I am trying to find out if Warner Brothers has definitively stated 
that they are only making GOF into one two hour movie.  Muggle.net 
has a posting of a recent interview by Jason Isaacs and he says they 
have scripts but no way of knowing who will be left in a "two hour 
movie."  Some weeks ago I went to a separate link for a petition to 
Warner Brothers asking them to reconsider and make GOF into two 
parts  (summer and winter release.  Any thoughts? Ideas?

Liz