The Pink Pikmin is a newly discovered type of pikmin in Pikmin 3 for the Wii U. Shown in the E3 2013 trailer captains can use these types of pikmin. In the official trailer  they are just seen flying in the backround. They could just be used as scenery, like a handful of plants in Pikmin 2. They are pink of course and have very small body with little wings, and a dark blue flower. These and rock pikmin are the 2 new types of pikmin introduced in Pikmin 3.
According to the 2013 e3 trailer, these pikmin can carrie items back to onions and ship easier by flying over dangerous enemies. They can also fly over some hazards such as water.