so far we have seen 2

3 more are coming later this year

the upcoming one is the waters of mars it will air sometime in November in the UK

here are all the trailers i have found

http://www.youtube.com/watch?v=fc9XiZ2A4xk this is the trailer shown after the planet of the dead

i just found this one

http://www.youtube.com/watch?v=ClNAiVhcIMA this is the most recent one and shows the most clips

the last one is in 2 parts and will be shown around Xmas in this the master has returned it is going to be David tennets last episode being the doctor the next doctor who series will be next year and will be season 1

Holy crap another Doctor Who fan on the site you are officially made of win.

 

Theres only 3 left with David's Doctor i wont be to happy when he has to regenerate, but at least The Master's supposed to be back and I think John Simm is playing him again. Thanks for posting these I was thinking of posting these but I wasn't sure there were any other fans on the site

Holy crap another Doctor Who fan on the site you are officially made of win.

 

Theres only 3 left with David's Doctor i wont be to happy when he has to regenerate, but at least The Master's supposed to be back and I think John Simm is playing him again. Thanks for posting these I was thinking of posting these but I wasn't sure there were any other fans on the site

 

yeah he is returning to voice the master i found one more

YAY! 2 more DW Fans on this sight! and I love the master =D