You should read
Private Eye!
[LIST=1][*]In June 2011, it published a story about production of Doctor Who's season 7 being in "chaos"[*]It said BBC bosses had been horrified to learn that all BBC Wales was producing for 2012 was a number of 'specials' (a bit like in 2009)[*]The BBC immediately published a denial, saying it was producing the usual 14 episodes[*]When asked when these episodes would be broadcast, the BBC suddenly went suspiciously quiet[*]Many months later, the BBC began to
sneak out information about the "broadcast schedule" of season 7 which showed - minute for minute - the amount of Doctor Who being shown in 2012 was much closer to the 'year of specials' predicted by Private Eye than the '14 episodes' promised by the BBC[*]The BBC later apologised if it gave fans the impression that all of season 7 would be broadcast in 2012.[/LIST]
There have been quite a few changes in the senior team at Doctor Who, and I think a big part of that is ensuring the production problems are resolved and we can return to a more consistent broadcast schedule for Doctor Who.
I imagine the preference is a straight run in September up to Christmas. My personal preference is a return to the schedule for seasons 1-5 (13 episodes from late March/early April and a Christmas special). But it seems those days are long gone!