Does anyone remember Brynjolf from the Thieves Guild in Skyrim? He always said.
Brynjolf: "Sorry lad, I've got important things to do. We'll speak another time."
Whoever voice's this character most likely is voicing the main character in the Fallout 4 trailer. They sound exactly alike, but I do not know for sure. For years people have thought this was a bug that forced his to say this line over and over again. There are rumors that the main character speaks a lot. If this is true there might not be anymore silent dialog boxes on the players end.
It all makes cents now he was working on Fallout 4. If true of course.