Super Limited Beta test already started, if you want to get a key check twitter.
1. Playable ships - Destroyers (DD), Repair Ships (AR), Heavy Cruisers (CA), Light Cruisers (CL), Battleships (BB), Battlecruisers (BC), Monitors (BM) and Aviation Battleships (BBV), Aircraft Carriers (CV), Light Aircraft Carriers (CVL).
2. Marriage system (I heard some people love it...)
3. Action Battle
and much more.
I heard this game have censorship problems but not sure why, I mean most shipgirls or better say Fleet Girls here have too much clothes for ships o.o
For more information check Reddit.