Doctor Who - Number of regenerations?

For those who are not watching/following Doctor Who, let me stop you right here and right now and guide you to the amazing world of Doctor Who!

And now for those who do watch/follow Doctor Who, the total number of regenerations the Doctor can undergo has been a crucial question, well not as crucial as the Doctor's true name..., but nonetheless an important question that determines the ending of the show. Well the one quick Google search and a quick wiki reading later (BTW - ton of spoilers in that reading) I am still unclear about the total number of regeneration the Doctor has or can have....

Today on The Mary Sue blog, I came across the article that has Moffat's statement on the Doctor only having 12 regenerations, but then there is this.... Also io9 has their post.... So in the end it is a penny in the air... and till it drops we have no clue what the right answer is....