Rise of the Tomb Raider is certainly one of the best games to have hit the Xbox One, especially in exclusive department. It won't be an exclusive forever though, as it is set to come to PC in early 2016 and PS4 later next year.
Amazon France look to have let slip exactly when you might expect it too. On the listing for the PC version of the game, January 29th is noted as the release date. This could be a place holder, but it seems weirdly specific for that. I'd wager that this is when we can expect it.
This is good news too. The game deserves to be played by as many people as possible. It really is quite great.