Just appeared in the Nuremberg toy fair the first images of the next 2 minifigure series.
On the left we have the expected series 17. It is going to be blue and will continue to have 16 minifigures. It is expected to hit stores in May 2017.
On the right we have a mystery collection. This collection should probably be the Ninjago Movie Minifigures Series. Like the Batman Movie Series, this collection will have 20 minifigures.
So it seems that LEGO has adopted the Standard 16/20: 16 for the common minifigures collection and 20 for the special movie collections.
Looking forward to see the first images of the next collection, the LEGO collectible minifigures series 17.