The group of people that are getting transferred (Oct 2012) aren't mechanics. They are the people mechanics call when there is a problem and need expert help. It's roughly a group of about 200 people. AA still needs mechanics to overhaul these aircraft. Of course with the BK filing who knows what's going to happen.
One of my sons friends first day is today, so maybe they will still bring new people on board.
Come for the interview and you can get a feel for what they are doing.