Amy Hennig, director of Uncharted 2, kind of lays out the feelings of many in the video game industry. She expresses that employees of studios may receive discretionary bonuses, but aren't "going to have a lot of sympathy for actors who want back-end residuals." She continues, "That's why we're talking two different languages when we sit down at a bargaining table."
The SAG proposal seems to acquiesce on the contract the publishers want, but asks that actors who play "principal roles" (think Nolan North) who drive the narrative forward would receive the same fee for three characters and double if they do six to 10 voices in six hours. As actors become more important in the video game industry, expect this issue to grow. Optimistically, if actors begin receiving residuals, it may bleed into development -- a terrifying notion for publishers.