Did you know, from the beginning, that Jane Doe would turn out to be Taylor Shaw, or did you have other possibilities in mind?
[Showrunner Martin Gero]: We’ve been pretty solid on who [Jane Doe] is since we pitched the show. Nowadays, networks have gotten real wise to a high-concept pilot that maybe doesn’t have anywhere to go. So, we really developed into the second and third season, in the pitch. When you do a pitch like this, if you just pitch them the pilot, they’re immediately like, “Who is she for real, though?” And if you don’t have an answer, you’re in trouble. So, I’ve known who she is and what her real story is for a long time. In the original pitch, I pitched what the mid-season finale was going to be and what the finale was going to be, and a general idea for what Season 2 is. We’ve stuck to that game plan. I’m anxious when I don’t know things about our own show because we do burn through plot so quickly.
Source and more: Collider