I know it's been talked about for some time, but it looks like it's finally happened - the next series of DW is to be split into two halves in 2011 - for spring and fall transmission, plus a Christmas Special!
Source here: http://www.bbc.co.uk/pressoffice/pressreleases/stories/2010/08_august/29/doctor.shtml
UPDATE: Moffat is referring to this now as not being a 'split', rather as Series 6 in the spring, and Series 7 in the fall, with Series 6 having 7 episodes and Series 7 having 6.
Source: http://www.guardian.co.uk/media/2010/aug/29/doctor-who-cliffhanger-series-split

Source here: http://www.bbc.co.uk/pressoffice/pressreleases/stories/2010/08_august/29/doctor.shtml
UPDATE: Moffat is referring to this now as not being a 'split', rather as Series 6 in the spring, and Series 7 in the fall, with Series 6 having 7 episodes and Series 7 having 6.
Source: http://www.guardian.co.uk/media/2010/aug/29/doctor-who-cliffhanger-series-split
