In this new Battleship featurette Director Peter Berg and his team introduces the film:
The battle for Earth begins at sea.
“A fleet of ships is forced to do battle with an armada of unknown origins in order to discover and thwart their destructive goals”
There’s also a new Japanese poster;
Goddamn aliens! Always aiming to invade our dear planet! No need worry though: we’ll kick them out! Mankind will prevail!
:)