Warlords of Draenor has all the usual gold making methods, such as gathering and crafting and playing the auction house. The only things new regarding those methods is the actual items found/made. Oh yes, and that crafting is much simpler than before.
The new idea, as you know, is the Garrisons. Among other things, they’re a source of pretty easy gold. If you have several garrisons, all level 3, you could easily be making thousands per week.
I don’t know whether Bliz will run with the garrison idea in the next expansion. Yeah, I know they say they won’t, but they said that about Flying pretty recently and then they said there will be flying. They’ve also changed their minds about a variety of things in the past, where they’ve said “definitely not” and later said, “Yeah, let’s do it.” Both factions on one server comes to mind.
Anyway, the Garrisons are a neat idea and I’m pretty sure that they’re something that Bliz will change someday. Why? You can pull 100-2k gold a day from your garrison and you don’t have to buy or sell anything. No gathering or skinning, no haunting the auction house, no endless crafting. Just check your mission table and hit the treasure missions. Gathering some ores and/or herbs and sell them off. Open up all your salvage and vendor or auction it.
Obviously for optimal results you will want to be level 100 and have a level 3 Garrison.