Acording to Ubi’s producers Karl Luhe and Ivan Balabanov, Assassin’s Creed Rogue ‘s map New York will be bigger than AC3 and gang infested, because this game occurs 20 years before the Great Fire. And There will be underground structures to explore, including ice caves and native hills.
In AC Rogue, There is a lot of new animals to hunt like (Polar Bears, Arctic Wolves and Narwhals) and hunting and harpooning will return using specific animals, In addition of a new system to upgrade and customize your character.
Your ship “The Morrigan” is upgradable and customizable, Also, you can sail with The Morrigan in AS Rogue ‘s Frontier version called “River Valley”. And about this Oil weapon in The Morrigan, Ubi commented about it and said “It’s a badass upgrade you can use against enemy ships to light them on fire and send their crew screaming!”
And about Shay’s weapons Ubisoft said: “As a Templar, Shay has access to the most advanced weaponry, like the Grenade Launcher and Puckle Gun.”
Haytham Kenway will return in Rogue, And there is a modern day story, but Ubi can’t reveal anything now.
More details soon.
Source: Assassin’s creed twitter