I keep thinking that this was a major missed oppertunity for Sombra not to be given a speaking role. At least he was cool enough for me with him being a swirling mass of nightmare fuel though. XD
Honestly though, if given the chance for him to make a return, who would you like to have him voice by? Personally I would LOVE it if they could get Jim Cunnings to voice Sombra. If he could give a voice like this to Dr. Robotnik; www.youtube.com/watch?v=NUa8DL… Imagine him when he puts a voice over Sombra's already growling voice.