update:
not much is known about the game other than a few thing's here and there it's been quiet , Since last E3
I will keep updating this thread about new new's about the game.
first up though is some great new's:
"The developers also said that there would be a strong focus on multiplayer, and that including a five-player co-op mode was “a strong goal,” but they didn’t elaborate any further."
Read more: http://g4tv.com/thefeed/blog/post/696286/warhammer-40000-space-marine-preview.html#ixzz0hVye6n2C
so strong Muilti-player, an 5 player CO-OP "wow a squad of Spacemarines" i guess that's expected there was a Carnifax spoted in the trailer.

The Carnifex (literally "flesh-maker", Latin for "butcher" or "executioner"), or Carnifex Primus , is a monstrous creature that acts like a living tank for the Tyranid Army
As Tyranids are constantly evolving their forces, many different variants of the Carnifex exist. However, all Carnifex share some common characteristics: they are very large creatures, standing significantly larger than a man; they have thick carapace, which provide excellent protection from damage, and they frequently use some of the bio-weaponry utilized by the Tyranids.They are comparable to the Space Marine and Orc Dreadnoughts in purpose.
Carnifex is a living engine of destruction that is impervious to small arms fire. Can be upgraded to have thornback armor, a barbed strangler, spore cysts, a venom cannon, or to project bio-plasma.
size :

Well At least he has a Powerfist.