So far, all the BBC are saying about the new Torchwood series is that it consists of five episodes to be shown over one week “later this year”. This vagueness about scheduling seems to be a bit of a BBC theme this year, what with the next Doctor Who special being officially announced to be showing in Novermber-ish.
Anyway, there is a trailer available. This is on BBC iPlayer, so quite likely won’t work outside the UK, but I’m sure a quick search on your choice of video site will turn up something. Apparently this is actually being shown on BBC America. If the embedded video thingy doesn’t work, you can find it on the BBC Torchwood site
 Which should cause some moaning about scheduling….