Re: Day of the Doctor certification and three different runtimes
Here's more information on the theatrical cut, from BBC America's press release
In addition to Matt Smith, the 50th Anniversary special also stars former Time Lord David Tennant and Jenna Coleman with Billie Piper and John Hurt. The theatrical events will include specially shot introductions and The Day of The Doctor: Behind The Lens, a 10 minute behind-the-scene featurette directly following the special. The short features Matt Smith, David Tennant and Jenna Coleman with Billie Piper and John Hurt, as well as lead writer and executive producer Steven Moffat, discussing their 50th Anniversary experiences.
"When David Marcus cited the great thinkers of history -- "Newton, Einstein, Surak" -- Newt Gingrich did not make his list." -- 24 January 2012