From what I can tell the original concept art from the development of the Au Ra race was first unveiled at FATE Tokyo after the designs had already been finalized and the race announced. Here's a summary of that panel with tons of screenshots. They go into a lot of detail on their creative process and how the dev team wanted to create a race that felt like Final Fantasy that would be popular without just rehashing miqo'te characteristics. I can find no evidence of the Japanese fanbase having "massive rage fit" over the concept art. I'm actually finding multiple jp sources with fans voicing disappointment that they didn't go with the wolfman concept.
