User blog comment:Bluegear93/Volus/@comment-1853169-20121009171606

Chris Schanche over on BSN said the following: "We wanted to expand on the available races to something less conventional to represent the continuing state of the war. We also wanted to build a pure support class, it's something we've seen requested more then a few times, and the Volus were an interesting opportunity to build a very non-traditional character with a power suite built around staying out of front line combat and an emphasis about boosting team score over personal score."

It is established that they can and do serve auxiliary roles in the turian military but I think giving them a biotic class is definitely on the silly fan service side for those who so adore spouting the "biotic god" meme.