Among the names DC is going to are Spin Master and McFarlane. But, Mattel will still be a license holder of DC Comics' preschool and girls' toys, which includes the "Super Hero Girls" line, which has undergone a massive reboot, including a certain character we all know about.
That leads me to Toy Fair 2019. What is unique about this event is that it's not open to the public; only the media and those in the toy and comic book industries can attend. Like most things these days, the fair can be followed on social media.
On a blog called Idle Hands are some pictures of the new DCSHG line, set to be released this fall. A new series will premiere on Cartoon Network in March with MadTV's Nicole Sullivan as the newest voice of Kara.
This picture has the action doll itself for about $9.99

And here is the DCSHG Teen Life to Super Hero Action Doll for about $19.99. It comes with two outfits, including a Kara one, where you can turn her into Supergirl

And yes for Stewart, she comes with a guitar...although it's more of a punk rock kind.
If anything else SG related, TV show or otherwise, should come up at ToyFair '19, I'll try to let you know about it.