There's a brief but interesting Metro interview with John Barrowman about his thoughts on his role in Doctor Who (where he gets to be 'sassier') and Torchwood series 2:
...He hopes the hit drama will go even further this time.So what does he mean by "going further"?
"What I would like to see is that we become edgier and we push the limit a little more on the adult aspect of everything.
"In the first series we played it safe a little bit and this second series, I hope that we will go further."