Sometimes the changes are many yet subtle, to the casual observer. You may not see any changes from physical appearance but Honda learned a ton of info this past year on what people do with the P1K and how it it used. There have been many unexpected ways in how the P1K has been put to use that were never originally considered for desiging this UTV.
I don't have any inside information I just know after riding Hondas for over 40 years that they improve and evolve machines year after year based on what works for the people that buy them. Look at the P500 and all the changes it has now gone through from the original 2015 model to the 2017 model. There will always be a group of riders who want more or didn't think enough was done, but conservative advances has been the stable mate for Hondas success.