I managed to watch the first episode of Mahou Shoujotai Arusu (Tweeny Witches) by Studio 4C today though! It was really short (about 9 minutes) and unsubbed but I highly enjoyed it. Studio 4C also did about half of the short films on the Animatrix DVD and I liked theirs a lot more than most of the other shorts. Tweeny Witches is a lot darker and weirder than its title might suggest. I hope there’ll be some fansubs for it available soon…!