***EDIT*** This has apparantly now been denied by the BBC.
Yesterday some news sources were reporting that the date of airing had been leaked as July 1st 2011 on both BBC and Starz, but now the Official Facebook Page has updated to confirm the rumours.
According to the page, Torchwood: The New World will premier at 9pm on BBC1 and BBC1HD on July 1st. This date falls on a Friday so make sure you put it in your diary. Time for the Starz broadcast is as yet unconfirmed.