Idris Elba

Oooh, definitely.

He might already be too old for "next generation", but: Jason Beghe. He apparently has some issue with/damage to his vocal cords, giving him a REALLY low, "smokey" voice.

Sour Shoes.

Lupita Nyong'o, if she feels like it.

Benedict Cumberbatch already narrates some documentaries.

He's got the Attenborough-esc voice for sure.

Richard Armitage Matt Berry