The more we talk about this, the more I'm starting to think this is a story meant to misdirect. A smoke screen so the real guy can slip backstage and get ready to be revealed. This is a list of names who were serious contenders at one time, but didn't get the gig.
The thing to note is we live in the internet age so it makes sense to release all credible candidates to the media. That way fans, like us, can give an opinion. If Eon has an unknown actor locked away, it may not be such a good idea to keep him quiet.
Look at it like this -
I reckon Daniel Craig would have been Bond had we not had the internet. He said Sony gave him the role, he's a friend of Barbara Broccoli, the Sun newspaper said he was Bond. As soon as the Craig story broke, many Bond and movie sites discussed Craig and the vast majority of posts were anti-Craig. "He's too ugly, he's too blonde blah blah blah."
Although I could be wrong, I remain convinced Barbara and MG saw those posts and reconsidered Craig. They knew he was too risky a choice and was rejected. My point being it's too risky to announce Joe Smith as the new Bond without people having an idea who he is, what he looks like.
The best feedback Eon gets is from the internet. Sure, they may think many fans are geeks but if enough people say Craig is wrong, or if enough people say Visnjic is wrong, Eon won't cast them. So it's unlikely the next Bond will remain a secret.