“I can’t tell you much, I’m too much of a fan of the show to spoil the fun but I can tell you she’s up to no good.Gomez also addressed the Master's gender change, a point of controversy among some Whovians last year. She says,
Even I was a bit shocked at her level of disdain this year. She has no boundaries that girl, she is very naughty.”
“Switching gender with the Master is change enough for now. We Whovians are a loyal bunch and don’t like too much change. I feel like I’ve rocked the boat enough for now, let’s not sink the whole bloody ship.”Michelle Gomez will return to our screens as Missy in the autumn, alongside Peter Capaldi and Jenna Coleman.
[Source: Doctor Who TV]