@zoo mom, he really is doing phenomenally well. He still spends a good deal of time pacing, which I believe became a habit for him while living an isolated life for all those years.
He is the king of sound mimicking. Phone, power saws, refrigerator, popping sound from uncorking a bottle of wine, you name it! He doesn't really say any words other than 'hello', but the sounds he mimicks are perfection! He anticipates when certain sound will occur and then makes that sound right before.
He's a very special little guy and I am blessed to have him.