Played this last night, the Blowy shell thing is hilarious, found one in a sunken shipwreck. The new double gun is very underpowered and it has 3 cosmetics that are locked behind tasks I apparently haven't done yet despite my over 310hrs of play so it's boring compared to my tricked out sniper etc.
The Harpoon's in this where already useful for getting loot quickly onto the boat but now that you can walk on the rope they are essential and make's traversing with loot to and from islands/outposts an absolute breeze.
Used the new skelly bomb and 3 skellies destroyed a Skeleton Lord for me which was funny to watch.
An excellent upgrade - online performance was perfect.