Very similar armor. If I recall, that is Sarah Palmer on the cover of Spartan Assault. And she wears the Scout helmet.
And then the Spartan in the Halo 5: Guardians picture looks very similar to her, with the Scout helmet, etc. So I definitely see a resemblance. But yeah, it's apparently a brand new, male character. --- IRON MAIDEN IS MY RELIGION! Gamertag: Demigod Elessar