Speaking on Twitter, Pratchett said that she wasn’t asked to work on Mirror’s Edge 2. She said, “It's really lovely that people care enough to ask whether I'm involved with Mirror's Edge 2, but I'm not & wasn't asked.”
She added that the game’s story didn’t review well and she considers herself a “casualty of that development process.” But she offered her blessing to the team that is now taking up the mantle. “By all accounts it's a new team on it, so go with God, I say. Create cool stuff. We always need more of that,” she said.
If you are interested in reading more of Pratchett’s writing within the Mirror’s Edge universe, she lent her talents to the comics, which were written as a prequel. Pratchett most recently flexed her writing muscles on the much more favourably received Tomb Raider reboot.
Little is known about Mirror’s Edge 2 at this point in time, though EA executive Frank Gibeau described it as an open-world action adventure game that will reach a bigger group of people. The title will be released on PC, PlayStation 4 and Xbox One “when it’s ready.”