wow, neat. i vote for the russian option on the dvds - did you check? does he operate the dvd player himself? (only asking because my brilliant DS is just about 10 and has never had any interest in operating things like that, i have to push him to do it himself if he wants to watch a DVD!!)

same DS had some echolalia type issues when he was dealing with speech delay and frustrations early on, around age 18month-22 months. Once I thought he was babbling and my SIL recognized that he was counting in Chinese lol pretty sure he heard it on a Baby Mozart video or something!! He has very little interest in foreign languages right now.