This New Power banner contains units who have recently received new weapons and refines for their 5-Star variants.
Klein (Argent Bow), Sophia (Eternal Tome), Delthea (Dark Aura), and Sonya (Dark Excalibur), are summonable as focus units for this banner. You can read more about their new skills in a previous news post.
This Summoning Focus is available now, and will end on the 24th of March, 6:59am UTC. This is a good time to summon for Sonya if you want her. As for the other three, that just depends on whether or not you value your Feathers more than your Orbs.