Yup, as it turns out, these books are part of the DC Icons series. I must've been living under a rock when it was announced, but I think it's a great idea to have popular YA authors write superhero stories that take place when the protagonists are teenagers. Warbringer was a good story (albeit non-canon IMHO) that left me wanting more, so I can't wait to read the rest of the DC Icons books.
In case you're wondering, the DC Icons series consists of four books (so far):
- Wonder Woman: Warbringer by Leigh Bardugo
- Batman: Nightwalker by Marie Lu - to be released in early 2018
- Catwoman: Soulstealer by Sarah J. Maas - expected to be released later in 2018
- An untitled Superman book by Matt de la Pena - publication in 2019