They are still in the writers room. And no filming will start till at least june from what i've heard.
When i was at the dvd release party, every single one of the cast/crew said fall, and they were almost positive it would be october.
If you think about it, it makes more sense to show it during fear fest, as it will be a huge boost for them. Starting it sooner might please us all, but i'd rather have it in october, when it feels right, and when they can have all the time they want to film and tweak and edit it to perfection.
In the meanwhile, grab the books and get reading! Issue 84 comes out wednesday!