Historically most of Pixar's movies were likewise intended to showcase new work in Photorealistic Renderman and other Pixar technology. I think this is to some extent inevitable in a fledgling industry. There are new horizons to explore in the artform, so why shouldn't every new movie be about exploring them as well as telling a story?
I haven't found time to watch Tears of Steel yet, I enjoyed Sintel a great deal and it's amazing how far Blender has come even since then.