I'd like to add, AT is running on Trinitycore, which have their patch for Warden under development (see
topic)
Yet, as stated above, it's not finished yet. basically the warden 'server' called Deamon runs on Win only now, but since its only a server, Warden on mac clients is still working.
Furthermore, as you can see in the above link, warden is opensource, yet it includes a table in the Database with all the signatures from different cheats, currently only a few signatures have been added in the database, and therefore Warden is not detecting everything as it should yet. It's up to the server admin to fill this table with data.
Also, Warden is the ULTIMATE anti-cheat. All the current anticheat systems are SERVER SIDE, meaning they run where the server is hosted, checking if you should be able to fly in that zone etc. Yet Warden is CLIENT SIDE, it can exactly check your computer and see what processes involve with Wow.exe and can detect memory injection and the likes.