Coinciding with their early release in some online stores, Zara was just previewed in the official page.As we knew, her ability is "regeneration". In addition to that, she's even tougher than Branwen (at least book-parameter-wise), so she's supposed to be a really persistent foe.
Her "zanpa" (long sword) is called "Fangbane", deals powerful attacks and can grow or shrink according to her wishes. And I never noticed before, but it has a glowing eye and quite resembles a ferocious beast on its own.
Her little wolf can transform as well (reverting to its original form?), and has a technique where it devours the opponent as a final blow.
So yeah, great beginning for the series, it's hard to tell who's going to end up more awesome.