Opt-in in Mercenery mode on Blackrock

Hello, question from my side ;
reading (again , and again ^^) topic in the general discussion about mercenery mode I have some confusin regarding Blackrock.
There is now (in account settings) option to "opt in" in mercenery mode, ok, i get ii unchecked (so I should queue as an ally when my character is ally) - ok, and nothing happening. When I am joining bg on my Blackrock ally character - I am still on the horde side.

So question ; is it not working for Blackrock realm ? or they just need some time to implament it here ?

The feature isn't fully implemented yet.
Proterean and Malaco both said that the option to enable and disable MM will come for ALL wotlk realms.