I get a slight bar wobble when deceleration with no hands on the bars. It's especially noticable while decelerating through 40MPH. I do not notice it at steady speed though or when a hand is on the bar. Most people I've talked to have this same problem and seem to think it's normal. Mine has done it since I bought the bike. The wheels are Roland Sands Judge wheels so this could be the only contributor if it is not normal.
Is yours doing this all the time (i.e. acceleration, steady speeds and deceleration???) You need to give more info.
Is yours doing this all the time (i.e. acceleration, steady speeds and deceleration???) You need to give more info.