Last week Herbalism and Mining nodes were finally activated on the Beta realms. This will only be a brief look at them because they are only showing up in one zone currently. I rode through Valley of the Four Winds and Krasarang Wilds but did not see anything on tracking in either location. That said, I've had a chance to do a fair amount of collecting, so I can give some useful information on gathering at this stage.
Currently nodes are spawning in the lower portion of the Jade Forest. The good news is that the nodes are quite plentiful and the respawn times are pretty fast. I've only found two herbs so far: Rain Poppy and Green Tea Leaf. At 525 Herbalism skill the Green Tea Leaf is yellow to you and the Rain Poppy is orange. Here are the XP numbers for them:
Green Tea Leaf = 13,900 xp @ level 85
Rain Poppy = 13,900 xp @ level 85
That's about 2/3rds of the XP you get for killing a level 85 mob in Pandaria. From what I'm seeing, Green Tea Leaf mostly spawns near trees and stands of bamboo while Rain Poppy is mostly near riverbanks. It looks like a pretty even mix of both throughout the zone.
Here's a pic of a Green Tea Leaf:
And here is a pic of the Rain Poppy:
Here is the pic I took of the Golden Lotus:
Unfortunately I'm having pretty bad luck finding Golden Lotus. I saw this one after collecting about 200 herbs. I'm now over 300 herbs and still haven't seen another, despite staying in the area that had the first one. Luckily I got a screenshot of it before it disappeared but sadly I did not get a chance to check the skill level required to pick it. At this point in time the Golden Lotus is very rare, but perhaps the drop rate will be better in higher zones. I'll have to try farming this again after they start adding herbs to other zones.