Katherine McNamara at the MTV Movie Awards 2015
Katherine McNamara talking about the upcoming Scorch Trials movie *
if you want to brighten up your day please watch this video
In relation to the Katherine McNamara being Sonya in The Scorch Trials thing: although her name isn't on the IMDb anymore, I feel like she still is going to be Sonya.
1) She tweeted yesterday that she was starting a new project
the same day that Harriet's actress, (and Sonya's co-leader), posted that she was going to, and starting, The Scorch Trials
2) She is being followed by quite a few of the cast on Twitter (Chris, Dylan, Rosa, Alex, Nathalie, Dexer) which in my opinion seems like a bit much for it to be considered a coincidence
3) She also just today started following a few of them on Twitter and Instagram (that she wasn't already following)
So yeah, I'm pretty convinced she is still going to be Sonya.