These creatures are from episode 7, The Rings of Akhaten. They resemble a creature who appeared with the fifth doctor in the Classic series, but this is most likely a coincidence.
The Doctor and Clara from episode 9, Hide, Set within a haunted house. In this clip The Doctor is wandering down a corridor while Clara hangs behind with Candles...when something startles her...but what is it?
This is obviously from episode 10, Journey to the Center of the TARDIS, Clara is within the tunnels of the TARDIS, without the Doctor unlike in an earlier trailer. Clara has turned around in either sudden realization or shock.
The first official look of the Ice Warriors in action! This is from episode 8, Cold War. A few frames on a spark hits the Ice Warriors armored chest, presumably from a weapon fired by someone behind the camera.
This particular frame is from episode 10 again, Journey to the Center of the TARDIS, The Doctor, Clara and 3 soldiers are running down a corridor in the TARDIS, The Doctor is also using his sonic screwdriver in its 'torch mode'.