A reliable Doctor Who source (link below) says in the article on the Time Lord species that "all thirteen" incarnations of the Doctor put the other Time Lords in another dimension for…something… I don't know what yet. But, once he was about to die for good, they granted him a new cycle of regenerations, another round of thirteen forms. Thus, a Time Lord can only have thirteen forms. It's most likely that the new forms are the ones the audience sees him in. So, operating on that theory, it makes sense that once the 13th Doctor dies, he dies for good, without regenerating, if canon is to be followed.

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

The most common ones I have seen are either Susan or Jenny.

Here is a whole article on the speculation, for anyone who has not finished Series 8, there are spoilers. It is an interesting set

I personally prefer the idea of here being Jenny. I think they could have utilized her better.

I thought the same thing about the girl at the end, although Juliet Landau should really be Romana... so fingers crossed for Susan!
*bounces*
I spent all of last night freaking out about this!
This is great!
OSGOOD
MISSY
ZYGONS
SUNGLASSES
GUITAR
HEEEELP

I hope I finish LOST before September 19th... or else Doctor Who will obviously occupy my mind until season 9 is over! X3

*waves flags, blows kazoo*

I know a lot of people didn't like Twelve due to his abrasive manner, but I think that's part of why I like him. Maybe it's because I write multiple Won't Put Up With That Nonsense characters myself? Anyway, this paragraph is just for spoiler protection, in case people see it on the preview. Is this enough text? It'd better be.

So: that was definitely Skaro, or at least a Dalek planet. Saw This And Thought Of Exterminate. ^^ Hopefully they'll be better handled than Rusty The Good Dalek.

Zygons are goofy-looking. ;) But shapeshifters do make for good monsters.

I wasn't counting, but there's at least two new monsters (apparently) in the trailer - the ghost-things and the welders. Ghost-things looked like another Moffatt 'here is a common fear MADE REAL' episode (see: Silence in the Library, Blink, Listen, multiple others); I'm not sure what the fear would be, but that was the vibe I got.

And the newcomer. Heh, given who every other Mysterious Character has been, is there any chance she's Missy again? ^^ I'd love her to be Susan (which might make the Dalek planet, um... Earth!), but I'm going to place an off-the-wall bet: Leela. Hey, she stayed on Gallifrey, didn't she? And the tone comes across as fairly classic Leela.

(She won't be Leela.)

September 19th is only two months away. ^_^

hS

Remember, Susan was happily married to David. Besides, we don't even know if she was a Time Lady (not all Gallifreyans are Time Lords, are they?)...

Okay, I'm just saying this, because I want it to be Jenny ;D

LOOK AT THIS!

THIS IS ACTUALLY HAPPENING

GUYS I AM SO EXCITED

I CAN'T USE LOWERCASE

THIS IS HUGE, GUYS

SEJBW;EOJRW0WFLJSDSEK

-Iximaz, who has a keysmash problem