McKellen in Magneto?
A hugely unofficial source has stated that Ian McKellen is most definitely in the Magneto prequel, and that this comes from a chat the source had with the visual effects supervisor on X-Men: The Last Stand (review).
Frankly the "scoop" from SuperHero Hype doesn't really seem that much of a scoop if you think about it. Forget the fact that he's listed on the film under IMDB, the very fact that the film is about Magneto becoming...well...Magneto, suggests that at some point we'll see the completed work. We may find that he has a final few scenes in the movie, or maybe he's in it more. However I don't think it's that big a surprise.
Also the scooper says that Silver Surfer is in Fantastic Four 2...ah, that would be the story broken a few days ago.
Still, good news that he will appear. The real question is how much are we going to see of the current Magneto and does he have a place in the prequel?