Here is a nice little article about the new Garrisons, bit vague but if you are like me, its nice to get a sniff of what it might be rather than the full on 3 year in advance spoiler :P

one amazing part:

Mechanical Picker Automates harvesting of herbs from the garden.

Although, I have missed farming for herbs in MoP. It seems I spend most of the time when I am farming, just looking for the herbs rather than collecting them and the collecting has been something I have done to relax in WoW for a very long time.