They never said anything about a New Game+...
http://www.nintendoworldreport.com/news/73235/pikmin-4-update-now-available-adds-additional-features
The Pikmin 4 update promised last month is now live.
The patch notes are available here: in addition to the promised Pikmin Bloom support and new difficulty options, the option to "roll over" completed save data to a new playthough has been added.
Also added was an option to skip the intro after the first playthrough.
