Jump Festa 2013 will be convened on December 22-23th in Makuhari Messe International Convention Center. One Piece will have 2 Stages (16:00 - 16:50 japanese hour both of them): first one 22th December with Mugiwara seiyūs and second one 23th December with the same seiyūs and Eiichiro Oda.
http://www.jumpfesta.com/stage/index.html
More information (about merchandasing, figures, videogames…) in next weeks ^^