I'm filing this under "Speculation" because I wasn't personally at the Q&A session where it's alleged to have happened. A friend of mine was present and is currently working on a guest post summarizing it, taken from his notes.
At a behind-closed-doors session for select journalists and Nintendo higher-ups that just finished less than an hour ago, someone asked Shigeru Miyamoto if Pikmin 3 was under development. After some digressing, Miyamoto allegedly blurted out "Yes."
More on this when I have time to follow-up on it properly, but if it is 100% true then it's pretty big news.
