Oh. What a surprise. A little kid plays a major role in this arc.

Both the episode and the intro seem to take a lot of content from random art that Oda has supplemented to the weekly chapters... for example

http://www.onemanga.com/One_Piece/537/01-02/
http://read.mangashare.com/One-Piece...3/page015.html
http://www.onemanga.com/One_Piece/536/01/
http://www.onemanga.com/One_Piece/529/01/