Irish actor Domhnall Gleeson has denied the rumours, saying:=
“There’s nothing to [it]. I heard about it from my agent [who] sent me a website, [and was] laughing about the fact that people were saying that I was being talked about. I was like,‘That’s lovely: my own agent is laughing at the idea!’.So, it’s not true and there’s nothing you can do about people just spouting a whole load of ***** on the internet!”
“It’s a great series. Matt Smith’s a fantastic actor. David Tennant and Christopher Eccleston – all the guys are amazing. So it was a lovely thought, but it’s not true.”So, with two of the three actors denying the report (the other, Daniel Kaluuya, has yet to say anything), it's looking likely that the report by Starburst was completely false. The search for the Twelfth Doctor continues...
[Source: Doctor Who TV]