"Torchwood: Miracle Day" Teaser Trailer!

The new teaser trailer doesn't show us anything from the upcoming series, all we here and see is the Earth becoming black and the sony, "Perfect Day" playing away slowly. There's also like the sound of a news report talking about people dying and the world basically ending. It's actually got quite a cool effect to it.
Here's the link to the trailer on YouTube: http://www.youtube.com/watch?v=Rvtb325viAg&feature=player_embedded