Yup, he's fully mobile and has been walking for the last 6 months.
He is also able to get increasing amounts of air around his trach and past his vocal chords, so he is starting to talk. He still preferentially signs most words that he knows a sign for but he has a handful of words that he speaks quite clearly: mama, milk, daddy, airplane, elmo, uh-oh, bye, ipad (you know, the essentials).
And he has developed quite the thing for Elmo.