It will be the same as with their Cata realm Neltharion, say goodbye to your char, your possibly invested coins and the time you put into that realm.
They create the servers, take the money they get when people invest when it launches and then immediately stop to care and bugfix.
I never donate for Warmane but i am not saying they are not woth it, its people's decision but i have premium account because of when molten wow crashed they give us free premium accounts,2 character boosts and 20 or 40 coins if i remember true.Whatever,i also sold too many golds in this realm in trade system for coins to my character and i am sad its dying now. And if they will close Outland, this time i dont wanna play in Warmane's other expansions.