Everything We Know About The Next Doctor!

We've had several small teases as to what The Next Doctor looks like, 

but is it enough information to work out who it is?

The Next Doctor as seen
in Series 5 Trailer #1

It's highly likely that The Next Doctor is a new actor and someone who has never appeared on the channel before. His height and body type doesn't match anyone we've seen elsewhere.

Mark & Sam with
the mystery person

He's already provided his voice for Series 5. 

For both Episode 1 & 2, he voiced The Skull Mask Guy. 

As well as, in two different trailers, the words 

'Hello Universe' and 'This Is Where Everything Changes' 

can be heard by The Mystery Person.

End Credits
of Episode 2

It also appears that his outfit might change between episodes, as seen in different trailers.

Someone's new coat
hung up in the Tardis

The Diamond isn't going anywhere...

The Mystery Man with the
Diamond round his waistcoat