Update:

Feral Interactive has officially announced Shadow of Mordor for Mac on their website, stating it will arrive for Mac and Linux "this Spring." Pricing and system requirements have not yet been posted. Watch a trailer below.

This seems like a reaction to the advertisement rather than a planned announcement. But given Feral themselves must have commissioned the ad from Maclife, it seems odd. Maybe just miscommunication?

Original Story:

An advertisement from Maclife Magazine has revealed that the Lord of the Rings 3rd-person action game Shadow of Mordor will be coming to Mac via Feral Interactive. This was spotted by a user of the Inside Mac Games forum.

The ad (pictured below, taken from the digital version of Maclife) gives no release date or details, simply that the game is "Coming to Mac," so we have no real idea when this might release. Though given the advertising it should be sooner rather than later. I'll keep you updated as soon as I have further information.

This accidental reveal seems to be an issue as the same thing happened in early 2014 where an ad revealed Tomb Raider was coming to Mac.

I'd like to state clearly that if you wish to support Mac gaming, wait until Feral actually announces this, or the release date is within a month before you buy it. The reason being, Feral will get zero money if you don't play the Mac version within a month of buying your Steam code/copy. This is how Steam works for Mac developers and to an extent, forces them to be secretive or everyone will just buy the PC version on sale and/or in advance, thus giving them no funds.