I've said it before, and I'll say it again: Mark Millar is the comic-book writer who cried wolf.
He's had quite a reputation for fabricating info for the sole purpose of getting himself (and his comics) press. There were his claims of "knowing" that Jim Caviezel had been cast as Superman/Clark Kent in Bryan Singer's Superman Returns and rapper Eminem "begging" him to star in Wanted. In both cases, he later admitted to making it all up.
Millar was recently chatting it up with Empire Magazine when he revealed details to his dream-project: His Superman trilogy with a "big-Hollywood action director" attached:
"It's gonna be like Michael Corleone in the Godfather films, the entire story from beginning to end, you see where he starts, how he becomes, and where that takes him. The Dark Knight showed you can take a comic book property and make a serious film, and I think the studios are ready to listen to bigger ideas now."
"The problem with Superman Returns was like releasing Stars Wars in '77, The Empire Strikes Back in '80 and then waiting 28 years to release Return of the Jedi, it wasn't relevant. I understand what Bryan Singer was trying to do, to pay homage to Richard Donner's original vision, but I think you should pay homage by doing something completely different."
"I want to start on Krypton, a thousand years ago, and end with Superman along on Planet Earth, the last being left on the planet, as the yellow sun turns red and starts to supernova, and he loses his powers."
I can almost guarantee the genesis of this interview involved Millar doing press for the currently-filming Kick-Ass! or the soon-to-be-released-on-DVD Wanted.
But I gotta be honest, his ending does sound all-kinds-of-awesome. But that part aside, we've literally heard all this before from Millar (Empire even acknowledges that in said article!)
That said, you folks have to realize that if Millar was really in the running to write the screenplay, he would never openly reveal plot-details of his script.
He was basically saying (in his own way): "Look, I'm not getting the gig. But if Warner Brother did hire me, here is what I would do..."
Nothing more, nothing less.