Yes the day has come. Steven spielburg had this to say in this interview.
" We have worked out -Yoinks!- off but the day of the Halo movies is set to begin next year. We have started on Halo the fall of Reach and the film script has been finished for a year. We will be working on four films in the years to come. Starting off with Reach. Then on to Halo CE. From there we are going to work on Halo 2 which we will call, " Halo:the second Ring. Then Halo 3 which we may title, “Halo: The search for the Ark.”
Yes they day has come my friends. Here is the video for the full interview. http://www.youtube.com/watch?v=XXLAyS1w7Ek&feature=channel_video_title