The Australian Broadcasting Company have announced that the fourth series of Doctor Who, starting with the 2007 Christmas Special, will debut on ABC1 on June 29, 2008:
The new series of Doctor Who will return on Sunday, 29th June on ABC1. The first episode will be The Voyage of the Damned (UK Christmas Special), and the fourth series will start the Sunday after that.There is still no confirmation from Channel 10 for the Australian air date of Torchwood Season 2.
Also, the Doctor Who Information Network has confirmed that the fourth season of Doctor Who will debut on the Canadian Broadcasting Corporation, on September 19, 2008:
Doctor Who will air on Friday evenings at 9pm. This was previously the time slot for Torchwood during the Autumn of 2007. The last two series of Doctor Who have aired on Monday nights at 8pm.