Given how little we know about the movie, it remains to be seen if this “voice” will allow the human characters to understand Spawn or if only the audience will be directly clued in on what he’s thinking and feeling.
Although Spawn will obviously have a heavy presence of the upcoming reboot, he will not be the main character.
Todd McFarlane also recently said that the movie will have a heavily police presence, primarily represented through Detective Maximillian “Twitch” Williams.
Either way, no doubt this “voice” will be one of the many ways that the Spawn reboot will supply creepiness and earn its hardcore R rating.