In case you haven't heard from the official patch notes:
"Herbalists of low skill can now pick herbs in Pandaria for a small amount of usable material. The yield an herbalist will be able to harvest from each node is determined by skill level."
"Miners of low skill can now mine mineral deposits in Pandaria for a small amount of usable material. The yield a miner will be able to harvest from each node is determined by skill level."
This means you can go directly to Pandaria to level your herbing/mining from skill level 1 (a welcome change). While doing this results in a speedier leveling time, you also miss out on all low level gathering materials used for Vanilla > Cata craftables. Not to mention the fact that gathering Pandaria "nuggets & stems" offers a significantly lesser reward than max level materials, yet still eating up the same node usable by everyone else. This means: less low level materials on AH, you make less money yet level quicker, and all Panda nodes are now much more contested.
So then, doesn't this mean Pandaria routes will be even MORE crowded? Are we bringing the CRZ issues back home? I know as it is that no matter what time of day I gather, there's always one other guy circling just ahead of my route. Now I'll be contending with every man and his dog. A perpetual flying conga line of gatherers.
And no, skinners. I'm so sorry. There's nothing in the patch notes about you :'[