I do believe it is possible for there to be a 12th doctor but time will tell just wait to see when Matt Smith stops doing doctor who then it is very possible
The way they are numbered in the show (not counting the War Doctor), Peter Capaldi is the twelfth. If you insert the War Doctor (John Hurt), then Matt Smith was the twelfth.
Who is the 12th Doctor of Doctor Who? The Answer you seek is Actor Peter Capaldi.
Eventually yes, he will regenerate into the twelfth Doctor.
Matt Smith
The eleventh Doctor hasn't regenerated, he's only been in two series so far.
The production team have not started looking for someone to play the 12th Doctor as of yet.
twelfth
It is said that Doctor Who Season 34 will not come out until Autumn, 2014. So that's quite a while away, but hopefully it will be worth it! I think the Twelfth Doctor is going to be, in the words of the Ninth Doctor, "Fantastic!"
it is twelfth
There have been eleven doctors so far (ten regenerations). The Doctor may have regenerated more times, but I doubt that that will affect the official counting.
There are several books that include the word "twelfth" in the title. Some examples include "Twelfth Night" written by William Shakespeare, "Twelfth Planet" written by Zecharia Sitchin, and "The Twelfth Enchantment" written by David Liss.
He is supposed to have 13 regenerations, unless something happens 'cause he revived the TARDIS and saved Rose, like, twice.