Two more low quality 50th Anniversary Trailer pictures have supposedly leaked. They cannot be confirmed and appear to be fakes. Neither of these "scenes" appear in io9's trailer description.
The first picture shows Tennant in front of flames, possibly an explosion.
This image has, most likely, been taken from a publicity photo from Planet of the Dead, for example this SFX cover, and flipped. The resemblance can be seen here:
The second picture shows the TARDIS and what appears to be John Hurt amongst bodies. Speculating, this could very possibly be placed on Gallifrey at the end of the Time War, with dead Time Lords, as the Hurtoctor escapes.
Apologies to everyone who saw this post's initial status. We have now been corrected and so have corrected the post.