http://www.pcgames.de/PC-Games-Brands-19921/News/PC-Games-03-15-mit-Vollversion-Emergency-2013-Titelstory-Rise-of-the-Tomb-Raider-1151367/
No confirmation of a PC version obviously but it's pretty telling Crytal Dynamics have let a PC outlet view the game.
At this point a PC version is confirmed, but who knows when it will come.