I write for this show!
Four girls are summoned to become the legendary heroes known as the Mysticons. They will undertake a quest to find the Codex.
From the Wikipedia entry
Mysticons is an upcoming animated action television series planned for release in 2017. The show will be a collaboration between companies Nelvana Enterprises and The Topps Company. Sean Jara, who’s written for the likes of shows such as RedaKai, Hot Wheels: Battle Force 5, The League of Super Evil and Naturally Sadie, will be writing for this series. It will be aimed towards girls. It was originally described as a series that aimed towards boys, but it changed demographics during development. The series is targeted at girls aged six and up.