We got to fight a giant boss in the Nier: Automata demo Platinum Games released in December, but that's only a small taste of what to expect on March 7.
They've now released a new trailer that not only shows the boss from the demo, but a few of the other gigantic enemies we'll meet throughout the campaign. It also shows a bit of exploration and story details, the latter including unmasked scenes with the game's protagonists, so this is definitely something you might consider spoiler territory. Still, it's definitely worth watching if that's not a problem for you.
Which aspect are you looking forward to the most? Exploring the fascinating world, fighting giant bosses, experiencing the intriguing story?