Total Sci-Fi Online reports that John Barrowman has confirmed that he has signed up for a fourth season of the BBC hit and Dr. Who spin-off, Torchwood. During an interview on BBC Radio 2, Barrowman confirmed that he signed up for the series, and that he expected it to get started in early 2010. There is no news on production start from Russell T. Davies at this time.
Torchwood's season three was a mini-series event, Children of Earth, which aired on BBC America this spring. The previous seasons included 13 episodes; the fourth season is expected to be the same. There is no information on what other characters who survived through the end of season three will be brought back.
With the dramatic endings of season three as well as Children of Earth, including the losses of several Torchwood members, it's unclear how Davies is going to revive the Torchwood organization. Captain Jack Harkness (Barrowman) himself had a dramatic departure, so it's pretty much a given that there will be a very dramatic return.