I'm kind of starting to wonder if Billie Piper's appearance will end up just being a few second cameo before her face shifts a second time into whoever the full time 16th Doctor will be.
I don't take that kind of shit seriously, because they like to screw with people. The Doctor regenerated into her, so she is The Doctor, it's just a matter of why and for how long. I guess this could be a situation like The War Doctor where she's disowned and not included in the count, but even then she's still technically The Doctor.And yet for the only time in 60-ish years you won't find a single statement to that fact from the BBC or anyone else involved in making the show.
Plus she said she's only back for a one-off appearance.