That's the power of light
When I posted videos featuring Link last week in Hyrule Warriors, everyone responded -- "great, but where's Impa and Zelda!" Well, we've already seen the former, but now Zelda's moves are on display for all to see in this new character trailer.
She's clearly using the power of light in basically all her abilities, including the power to create divine seals on the ground and make them erupt. She also has access to her bow, and her general sword fighting style reminds me a bit of Dynasty Warrior's Cao Cao.