Zelda producer Eiji Aonuma has teased an alternate ending for The Legend of Zelda: Breath of the Wild. In an interview with IGN Portugal, he said that a different ending will be shown “if you meet certain criteria.” “If you do a few things, you may see a different ending,” Aonuma teased.
http://nintendoeverything.com/zelda-breath-of-the-wild-has-an-alternate-ending-according-to-aonuma/
I think the ending is going to be affected by the side quests just like majora's mask, it's not going to change the timeline or anything like that. I think...
this
or this :(
or this