Davies addressed the fan theory that Mrs Flood is former companion Romana as she was wearing a similar costume - and he didn’t quite rule it out.
[…] “Probably because she’s wearing white fur, people are going to think she’s [Time Lord companion] Romana, aren’t they?”
Davies added: “I promise you answers to that. […]”
True, it’s when the mystery comes to bear on a current story that we’ll see how it stacks up. As long as there’s a payoff eventually, it’ll at least be better than “Empire of death”.