The video features characters in the alpha version of ARR running through Gridania. According to a community rep on the official forums:
The city-state has taken on an all-new look that features everything from a refurbished aetheryte plaza to cuddly delivery moogles! We really wanted to liven up the mood of the entire metropolis, so we focused on bringing the surrounding environment to life by adding babbling brooks, lush foliage, and a dynamic populace. You'll also notice that the names of unique landmarks appear on screen as you explore.
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