The second season of Sailor Moon Crystal kicked off earlier this month. And, with the new season came a new story arc.
Specifically, the second season covers the manga’s Dark Moon Arc that introduces Chibiusa (and Sailor Chibi Moon by extension).
To promote this new chapter, Viz posted a teaser to their YouTube channel. It’s short and contains no new footage, but the trailer does its job of reminding viewers that there’s more to come.