Most people have been complaining that the Walking Dead Game Animation takes too long. Each new episode comes out at 4-7 months. Instead of taking 4-7 months to make it actually takes 3 weeks to 2 months to make. That reason is that the Telltale Games Staff can't just concentrate on one game. As we all know animation is difficult and it takes 5 mins to 60 mins to just complete 5 seconds to 20 seconds of animation. The animation of the each episode is about 2 hours - 3 hours. Since telltale games are working really hard simultaneously, the animation takes about (what i said) 1 - 3 months.
So please stop complaining and just wait it out.