Bleach: Brave Souls looks to be a solid mobile title from the legendary franchise. Creator and real King of Souls Tite Kubo had a hand in some of the art, namely a new form for Ichigo. The description is below:

“A special version of Ichigo to celebrate New Year 2019. This Ichigo features him releasing all of his latent powers, not just his Soul Reaper and Hollow powers, but also the Quincy powers that lie dormant inside him.”

So this is Ichigo having fully realized his powers as Shinigami, Hollow, and Quincy. Maybe this is what had Yhwach so worried. Or maybe he wanted Ichigo to get this strong? Regardless, it's unclear if this form is even canon, since it's just from a mobile title. Maybe the fact that Kubo himself designed it makes it canon? Discuss in the comments below.