Since I've been going through all the GBWC's case files (just finished by the way) and having the story where we first ran into MC Pharaoh and everyone's "favorite" gangsta rapper, Zagnut, fresh in my mind and then reading the opening bit of Toy Soldiers, Part One... I think I know who the Soul Tracker is.
Really looking forward to the drama on this one.
I'm also curious as to whether Doc Belmont will show up. It would seem fitting, giving his and the Necromancer's past meeting.