Time Change

Apparently more time was needed.

While announcing that this summer's sequel How to Train Your Dragon 2 has crossed the $600 million mark over the weekend, DreamWorks Animation has also revealed that they will push back the release of How to Train Your Dragon 3 by a year. The third installment in the fantasy adventure franchise was slated to arrive on June 17th, 2016, but now the sequel will arrive on June 9th, 2017. It'll arrive just a couple weeks after The LEGO Movie sequel and one week before some unknown Pixar Animation film. ...

Here's an educated guess: That June 17th '16 date could wiggle around some. Two years out, it's likely not all that firm.