The ESRB in the US has rated Tomb Raider and at the same time provided some new details on gameplay.
According to the description provided by ESRB, the game will include a demonic lair and demonic soldiers. There is also a description of what happens to Lara should the player fail at certain actions.
Here's the description:
Rating summary: This is an action game in which players assume the role of a young explorer named Lara Croft who investigates a mystery surrounding an ancient queen. As Lara, players explore caves and ruins, and use arrows, firearms (e.g., pistols, shotguns, machine guns), and bladed weapons to battle wild animals, human enemies, and demonic soldiers. During several sequences, Lara is depicted getting stabbed, beaten, strangled, or shot by enemies; these close-up deaths occur as fail scenarios, usually when players miss certain action cues. A handful of cutscenes also depict enemy characters shot at close range. Large blood-splatter effects occur when characters are hit; one level depicts a demonic lair covered in dismembered human corpses--scattered limbs and pools of blood are prominent. The words "f**k" and "sh*t" can be heard in the dialogue.
ESRB has given the game a mature rating based on the description above.