From what I've seen the new "diplomacy features" are just modifiers for AI's chance to hate you, or love you.
From what I've seen so far in the videos, it will ONLY cause endless peace, just like BNW expansion did to civ5, where you have to use AI-changing mods to actually make them go to war. Otherwise they'll just be too damn afraid to do anything to you. Not that AI would declare war often right now anyways - in those few games I've played only ONCE I got attacked, by a force small enough to be repelled by a city with single Ranged Marine unit..
Ocean gameplay is nice and all, but... what I actually wanted from expansion:
- larger maps (largest map in BE is about as big as standard map in Civ5).. I get 4 cities and they cover 1/4 map? lol. Not to mention map generation creates a really weird impassable continents where half continent is impassable and the rest is literally just beach..
- actual map editor and a fuction to save a map to use later (like we had in civ5)
- actually doable covert actions. I usually play on epic, and not a single city was able to last (without a change of owner at least) till I frikkin finish that quest for recovering info in any game I've played so far, because it takes about 35 turns to get enough intrigue and another 33 or so turns to complete quest covert ops. That means I was never able to do anything at all with covert ops..
- more different resources, instead of whole civ depending on 1-3 strategic resources of which you need about 100 if you want to build both buildings and units (since instead of civ5's 1 resource you generally need 3-6), generally that means I don't have enough resources even if I take the virtue that doubles their quantity, and other civs refuse to trade unless you give them back obscene amounts of favors.
- option to hide trade units completely (engame is just a mess of trade convoys with every civ having 25+ trade routes)
- "favors" actually doing something useful, instead of little things like having to rack up favors just to make AI sign cooperation agreement or open borders, which civs in civ5 offered voluntarily or for minor cash bribe
- civs having smaller "THIS IS MINE" territory, because with the maximum map size of BE, they each "covet" about 1/3 map, and they're really butthurt about you settling any cities at all.
- unique units for civs... current system is NOT made for modding. You can probably add an endgame unit just fine, but making an upgradable one is not possible without writing a lua bible
- fixing bugs! those gameplay videos make me really worried, because unless they play on 8yo PC, I really expect the game to react faster (quests etc took 3-20s to trigger, etc).. no word if they at least fixed the current UI bugs