This motion pictures giant has been known for cross acting in so many movies. Apart from his current movie, Dawn of the Planet of the Apes, the actor's role has gollum as become a stuff of legend.
Through his company The Imaginarium, he has worked closely with Mark Ruffalo, Here is what is had to say about the matter,
"The Imaginarium is the performance capture consultant, and I'm playing a role (in both films). On The Avengers, I've been working closely with Mark Ruffalo."
When he was asked if he's face will be showed in Age of Ultron, Here is what he said:
"I'm not at liberty to mention. But it's all the same to me. I've never drawn a distinction when playing a role, whether it be live action or performance capture. Acting is acting. It's just basically what you wear to the set that's different."
He said that the technology that Mark Ruffalo will be using as Hulk in Age of Ultron will be more advanced that the one he used in the previous movie.
Performance capture was used on the previous "Hulk," but not to the same extent Mark is using it now. There are tools and ways of working with an actor that makes them feel that they own the character. And a character the size of the Hulk needs ownership, which Mark has now."
Who would you like Andy to play?