They've never announced they will do a Dr. Who game. I'm not saying it's impossible, but they haven't announced it officially. Connors has said
fans request it often, and it would be interesting for them to try to do but they'd have to crunch numbers to make sure it was worthwhile. Basically, "we'd like to, of course, but no guarantees", and he also stated they'd like to try other IPs, "crazy, risky licenses." It seems like all the newsites are quoting this article when they mention Telltale doing Dr. Who, so it's not at all a
definite thing, just to be clear. I'm sure the more interest it generates the more worthwhile it would seem to them, but there is nothing to say that they're even negotiation for the license let alone that they'll announce making the game within the next year.