And the star in question is Eleven himself, Mr Matt Smith! Announced about a minute before this sentence was written by @bbcdoctorwho, the official Twitter account for Doctor Who. The star said “To carry the Torch is an honour, one I thought I’d never get, I’m very excited!”
Matt Smith will be running the torch through Cardiff tomorrow, Saturday 26th May.
Speculation has been encouraged by @bbcdoctorwho throughout the day along with the hashtag #whowillrun, with retweets from many fans wanting previous Who star David Tennant to be the bearer of the Olympic Flame, in reference to the Series 3 episode Fear Her in which the Tenth Doctor performed the every same feat.
Of note to me in hindsight was one fan who thought that the volume of retweets for people guessing it would be Tennant that meant it would be him. Looks like the Doctor Who team trolled you all!