Shigeru Miyamoto unveiled the info
A recent interview of Shigeru Miyamoto by an Spanish newspapers revealed that the company has plans for a new Pikmin game that will be revealed at this year's E3.
El Mundo, a Spanish newspaper interviewed Nintendo's guru Shigeru Miyamoto and among the bunch of question he asked, he revealed that a new Pikmin is expected to be shown at this year's Electronic Entertainment Expo.
Furthermore, Nintendo told Kotaku this following:
NEWS SOURCE #1: http://www.elmundo.es/elmundo/2012/04/16/navegante/1334559905.html?cid=GNEW970103
NEWS SOURCE #2: http://kotaku.com/5902458/nintendos-bringing-new-wii-u-pikmin-and-mario-to-e3
Our thanks to 'Kaos2K' & 'Valwin' for this news story!