By not dying at Trenzalore the Doctor has changed his own future.

Until The Time Of The Doctor, the Eleventh Doctor WAS the final incarnation.

With that In mind, I personally think if the Valeyard is around as a separate entity, it would have to be because he escaped as a separate consciousness when the Ganger Doctor was created and the last time we saw him he was a bundle of nasty thoughts hiding in a pile of ganger gloop

Ah but! if the Valeyard is part of, but exists outside of the doctors timeline. he is from the future and his creation could be seen as a fixed point in time, from the vaylards point of view the doctor was always going to get extra regenerations, was never going to die at Trenzalore and he would be created.

the 11th doctor was crying over nothing and was always going to regenerate into 13. (we saw his eyes in the 50th). the real question is what would have happened if the valeyard won in "trial of the timelord" and had taken 6's remaining regenerations. He would never have been created, so he could never have taken them and would exploded in a puff of logic. with 6 popping back into existence...

No explanation but i'm going for either clara in the future or






susan.

Thinking about the Death theory a quote popped into my head. In the Discworld books ones of the characters, Vimes, sees Death as he's trying to escape an underground cave. When he's established that he's not dying Death reveals that when Vimes is having a near Death experience that means that Death must have a near Vimes experience. The Doctor has had many near Death experiences so maybe this version of Death became obsessed with him during her near Doctor experiences

From the Dyffryn Gardens website...http://www.nationaltrust.org.uk/dyff...r-information/

'Notice: There will be some disruption to the gardens this week as we have a film crew in. The Pompeian Garden will be restricted access on Tuesday, Wednesday and Friday with it completely closed on Thursday. We apologise for any inconvenience caused. '

No date on it though...wonder if this means there will be more from Missy...

I thought they'd wrapped filming.

I don't know who she is but I reckon Michelle Gomez is gonna have a tremendous time playing her .

Dalek Caan in human form.

Or maybe the Master's TARDIS?

If she's River Song or the Master I'll honestly consider on never watching the show again

The Doctor's Daughter Jenny turned evil.

Let's say - for now - that she's a completely new character and really is some sort of "angle" in some version of "heaven"...

...we can say that the Doctor really does "die" and is "reborn" cos he's not simply "made better" and there is even a "birth pain" involved.

So maybe there's a time related element involved. Just as dreams can last minutes but feel like hours within the dream, what if that split second when 11 changed into 12 had the Doctor in "Heaven" for "a thousand years" - so he really may have known "Missy". She'd only know him by his "death" face cos he wouldn't become 12 until he was "reborn" - hence her surprise/delight at his new voice.

As for him being her "boyfriend" - maybe the much younger looking 11 was her "boy<SPACE>friend" - the only others we've seen in "heaven" are a girl and a cyborg.

All that with another "more facts about timelords" type plot (in keeping with many others since 2005) and no need for Missy to be anyone we've met before.

Well I thought that she's probably a female regeneration of The Master.

Especially when it appeared to be a female hand which picked up The Master's ring when his previous body was burning.

I get the feeling that she/he may have just gone into a different body rather than a straightforward regeneration.
I'm sure that i remember one or two Doctor Who experts on here years ago mentioning that he'd done something like this before.

.... She could be the TARDIS..... But perhaps she's the Great Intelligence, gone completely batty from jumping into the Doctor's time line....

No idea why she would be "collecting" dead folk - so far a baddie who suicided (perhaps) and a human that gave her life to save the Doctor and Co.

We were shown exactly who that hand belonged to in the end of time.

who was it ?

http://tardis.wikia.com/wiki/Trefusis

I'd be angry, but that's less about it being a woman and more about it not being John Simm.

My personal theory is that either the Valeyard is a future incarnation of The DoctorDonna, or is waiting on the other side of the Crack, having been created when 10 forced his own people back into the war.

You might be on the right lines there. It's simple but it makes sense.
The Missy being The Master idea is quite probably a deliberate red herring as it's probably too obvious. Which is probably supposed to mislead people.

In 'into The Dalek' one of the features of the story was that the Dalek saw The Doctor as evil, and liked it, and took inspiration from it to be a mass murderer of Daleks.
He's also asked Clara if he is a good person.
He also practically murdered that soldier bloke and didn't bat an eyelid.
To me these kinds of things appear to be foreshadowing what is probably to come later in the series.

If this theory is right obviously she won't literally be death, but a metaphor for death all the same.

This Missy is possibly as somebody else speculated, like an incarnation of The Dream Lord. She might even be another manifestation of The Tardis itself, like in that Doctor's Wife episode. Perhaps like a conscience which buries all the bad stuff The Doctor does as he sweeps it under the carpet and forgets about it.
The garden probably is a Tardis, but not another Tardis, just an interpretation of The Doctor's own Tardis.
The people who die (or who are sacrificed by The Doctor) are possibly vacuumed up into the Tardis and exist as a terrible reminder of what he's done. I can see how this may be held up to him like a mirror later on in the series.

Were we? I must have completely forgotten.
Anyway I've changed my mind about her being The Master now. I don't think they'd make it that easy to guess.

The does suggest that she might be some kind of mirror of The Doctor in some capacity. If not The Dream Lord, something very similar.
The Valeyard has been name-checked in the last series so that character is still a definite possibility too.

That's the line I'm leaning towards too. The Doctor made a point of asking why he had the new face that he has, as if it was a kind of subconscious choice. Which may bear some relevance later too.
I would imagine that The Tardis chose to look like Suranne Jones before because it was the right face for that Doctor at the time, and if Missy is the same sort of manifestation then she is probably the right face for this Doctor.

You make some very compelling points.
In regards to The Tardis decor it seems to get redesigned by different regenerations of The Doctor. Boys like techy things and flashy lights, so maybe if this was The Valeyard she'd like the Tardis decor to be something like the garden.