You can aim each ship's guns separately, upgrade your ships as you see fit and take on co-op and multiplayer battles in addition to the main campaign. The whole package is impressively thorough, and in that sense, the trailer is dead on.
Leviathan Warships is a turn-based naval mobile strategy games. Your job is to guide a series of ships through watery battlegrounds, leading them turn by turn against your opponents. The game is similar to Bungie's Crimson: Steam Pirates, in that you guide ships around by dragging them, but it's much more complicated.