Ronja was directed by Goro Miyazaki and jointly produced by Studio Ghibli and Polygon Pictures (Transformers Prime). The art design combines traditional hand-painted 2D backgrounds with 3D CG characters. It's a fascinating combination of old and new, and even if it lacks the lush animation of classics like Heidi, Girl of the Alps (which is clearly a major influence upon this series), I am greatly impressed at what the younger Miyazaki and his teams have created. This is a series that is worth watching, and may point to the future of Japanese animation in the CG-era.
A release date for Ronja has yet to be announced, but it is widely believed to happen before the end of this year. Likewise, a Blu-Ray and DVD release is also widely expected sometime next year, but is yet to be announced.