While we're a bit light on details, we do know that Feral Interactive are bringing Crystal Dynamics' Tomb Raider to Mac later this year. They say to expect a mini-site soon for the game, which likely means that they're almost done with it.
I assume this trailer is Mac footage.
Rise of the Tomb Raider FAQ explains that developer 'didn't intend any confusion'
11:00 AM on 08.23.2014