The maestro himself Stephen Chow.
Actress Xu Jiao during the panel after the premier. When asked why he chose a girl to play the lead part of Dicky Chow. Stephen Chow said that Xu seemed to be the child that would be easier to work with from the casting for the movie. Either way she does a great job and if you didn't know beforehand that the character is played by a girl then it probably would never occur to you until you found out this info.
Martin Wong of Giant Robot leading the discussion panel questionnaire. CJ7 is playing now in limited release, the trailer can be viewed on Youtube and the movie's official Sony Pictures site.