AC4: companion App, Treasure Map, Where is Your Gold. Assassin's Creed 4...

This video contains my personal guess. This is not the Official Ubisoft video, I have edited video content, left the audio content unchanged.
Companion Apps will help to navigate the world and manage missions of your fleet.
Treasure Maps will give you naval coordinates that you will need to write down in order to find the locations.
There is a hido where you can storage your gold and treasures. My guess it is inside of Portobelo mansion.
Enjoy!
Game Director Ashraf Ismail and special guest, Ralph Ineson, will show off the exciting gameplay in the latest installment of the epic Assassin's Creed tale, discuss how the team has brought the true, gritty era of pirates to life and share some exciting news about the Assassin's Creed universe.

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Кредо Убийцы 4 черный флаг.
アサシン クリード4　ブラック フラッグ
刺客教條4：黑旗
刺客信条4: 黑旗