Those updates better be more fleshed out than they sound like if they want the game to still be alive come fall.
New enemy type. As in, a single new enemy type? Even if that includes multiple enemies of that type it's not enough. People are complaining about a lack of content and they're solving that by introducing a new enemy type? The team should, quite frankly, be in panic mode by now and try to get as much new stuff into the next update as possible. For starters they could include Zombie pirates with poisonous attacks to bring some diversity to the skeleton fights. It's not much but at the same time it wouldn't require a whole lot of effort. Out at sea there could be packs of killer seagulls or squids. Enemy ship encounters is also a no-brainer and these could include zombie ships, demon ships and of course ghost ships. For ghost ships there could be some required items to actually be able to engage them (like the map in Wind Waker). There could also be whole ghost islands to find and explore.
New ship types should be introduced like now, along with more options for sails, cannons, cannonballs etc. and new mechanics that makes use of them.
I'm not playing Sea of Thieves so perhaps I shouldn't bother talking about it but I was interested at one point and it's really frustrating to see a game that had a lot of potential get sunk because of pure laziness.