Adding to Huey's comments. They just started to release some official information on the apparently Turian/Krogan cross husk type. They're called Adjunts I believe... just got an official name recently courtesy of the dev's twitter account. I think we've only got some concept art and models at the second, but there may or may not be one featured in the upcoming Invasion comic series (that or something else entirely, the fanbase is going for actual protheans but who knows.)