Mark Ruffalo hopes Bruce Banner and the Hulk will be represented, but just the fact that he received the script kind of answers that question, doesn't it?
— Mark Ruffalo (@Mruff221) November 25, 2013
Filming under Joss Whedon begins in February, so most of the cast will probably start seeing scripts soon. The Avengers: Age of Ultron will be released on May 1, 2015.
Let's hope Ruffalo updates us with what he reads after he's done!