My gut reaction is that this purpoerted e-mail isn't real. Why? Because Fox still has distribution rights to the OT. Disney would not be releasing this, unless they've made some secret rights deal with Fox that none of us are aware of.
Read this Ars Technica article. (Specifically, this is page 2. Page 1 is about the state of the OT elements, but it just draws from a previous AT article which was based on zombie's information.)