This is only reddit post with voice overs discovered.
https://www.reddit.com/r/heroesofthe...ation_strings/
But look at it, is mentioned name Deadman's stand. Further more there is voice overs for Mira Han and Matt Horner as well. Possible heroes? Keep in mind, they were announced as CO-OP commander for SC2.
Maybe this will be related with upcoming Western Clash what will happend on IEM Katowice 2018?