We pretty much already knew this, but confirmation from Russell T. Davies:
http://www.tvguidemagazine.com/news/torchwood-planning-fourth-season-3168.html
http://www.tvguidemagazine.com/news/torchwood-planning-fourth-season-3168.html
Torchwood might not have concluded its run at the end of the thrilling miniseries Children of Earth after all - Ianto’s tragic death not withstanding. The new year could bring some “very good news” for fans of the sexy sci-fi series, creator Russell T. Davies tells TV Guide Magazine.
“The recession has hit British television, but fingers crossed, it will be a go. We expect things to start to move in January. We’ve got great ideas for the show. I think there’s a further lease on life for many years to come, but certainly for a [fourth season],” Davies says. John Barrowman is finishing his run in “La Cage Aux Folles” in London, so there’s plenty of time to trade his feather boa for Captain Jack’s trench coat.