Just watched that trailer and a few points that make me not want to play it:
43 seconds - the land is pretty much just a multiplayer lobby where you can dab and dance to some other weirdo on the internet
2:56 - harvesting materials looks like you shake a tree, some fruit falls and then you get ting ting sound like you would when you drove over a banana in Mario Kart
3:04 - Crafting looks like a few cutscenes of someone whacking something and you get materials.
3:40 - Flame Throwers
3:44 - Rocket Launchers
3:46 torperdos
4:05 - machine gun
4:45 - boarding, doesn't look like you can actually board other ships for a scrap like in black flag, just a cut scene. Probably one of the best bits in black flag
5:20 - Personalise your look so you can act cool in front of your internet friends who are all actually just sat in their Y-fronts
5:50 - Weather looks alright
6:46 - attacking forts looks like something just flashes red and you shoot it, then probably another cut scene to show it being destroyed which sort of indicates there will be no ground attack options
Seems like I don't like this game? Pretty correct, when I first heard about it about 5 year ago it was tagged as a living the golden age of piracy but its not turned into some watered down crap to sell DLC to the masses by the looks of it.
I was hoping for some Black Flag style with all the best bit of the ship battles along with a decent accuracy for the time.