The main addition in this game, in addition to a larger and complex map is: The verticality.
Now armed with a grappling hook, you can climb the walls of this mountainous region of the Himalayas rather than circumvent obstacles. It is also the coming of the first air vehicle which is not without consequences for the duration of your travels (he soon will be your means of locomotion preferred).
Speaking about the campaign, it is modeled on other worlds open in terms of duration. Your choices will determine in whom you trust and what will be the heir of the Kingdom. Turn aside probably fast enough reason for your visit in the area: drop the ashes of your mother Lakshmana.
One thing is unfortunate: Pagan is not as present as it was Vaas in 3. It rarely appears and only these interventions will remain on the air in your head.
It is also a shame not to join his camp (I will not spoiler: see the end to understand).
In conclusion, this is a game to have in his collection. You have a bond with your environment, including animals. You will often prey in this world but its beauty you will forget.
The sets are real works of art and it will take you some time to discover these beautiful places.
My next games: Tropico 5, Mad Max, Star Wars Battlefront, Battlefield 5.
Enjoy your games!