ValueSubtracted

YouTube: Season 2:Epilogue

As everyone said farewell to this iconic Doctor, they also got sight of a very familiar face as the Doctor regenerated and it was none other than Billie Piper… Billie first appeared in the Whoniverse when Doctor Who returned to screens in 2005, as Rose Tyler, the much-loved Companion to the Doctor played by Christopher Eccleston and David Tennant. But just how and why she is back remains to be seen…

Speaking of the surprise twist, Russell T Davies adds “Billie once changed the whole of television, back in 2005, and now she’s done it again! It’s an honour and a hoot to welcome her back to the TARDIS, but quite how and why and who is a story yet to be told. After 62 years, the Doctor’s adventures are only just beginning!”

Speaking of her return, Billie said: “It’s no secret how much I love this show, and I have always said I would love to return to the Whoniverse as I have some of my best memories there, so to be given the opportunity to step back on that TARDIS one more time was just something I couldn’t refuse, but who, how, why and when, you’ll just have to wait and see.”

Official Site: Ncuti Gatwa says final farewell to the TARDIS as the Fifteenth Doctor regenerates...

the implication that he is never going to come back and that he’s been replaced by a human dad

I took it more as him knowing he was going to stay away during Poppy's childhood for safety's sake, and that he would have a different face when he returned.

I wanted to add that Thirteen's appearance has really grown on me - I think she's the one incarnation of the Doctor who would be able to drop the sanctimonious "I have to stop you" bullshit so quickly, and help Fifteen instead. The others would have gotten there eventually, but she's the version most equipped to get there so quickly.

I hope so, too - right now, I don't see any reason not to take him at his word.

He mentions being tired and the role being demanding a couple of times in "Unleashed", too.

The bone beasts were alright, but I feel like the explanation didn’t really make much sense, and surely they could have found a better name than “bone beasts”.

Like you, I also went back to watch the old Omega stories, and I figure the Bone Beasts were a nod to Omega's bird skeleton sidekick.

A gap is inevitable, for sure.

But RTD has been talking about actively writing season three scripts for quite some time, so maybe it won't be too bad.

Ncuti: "It was always the plan to do this amount of seasons. Plus, it's a role that demands a lot of you, physically and emotionally and mentally."

The Disney deal may be up in the air, but I'm genuinely not concerned about the show's future.

YouTube: Regeneration, Omega and THAT RETURN | Behind the Scenes of The Reality War

I think they said it was due to the genetic bomb, but I'll try to double check when I inevitably rewatch it.

This article on the official site does absolutely nothing to clarify the situation.

Speaking of her return, Billie said: “It’s no secret how much I love this show, and I have always said I would love to return to the Whoniverse as I have some of my best memories there, so to be given the opportunity to step back on that TARDIS one more time was just something I couldn’t refuse, but who, how, why and when, you’ll just have to wait and see.”