Patch 4.0.3a will be deployed on live servers this week and will change the world of Azeroth forever. This will affect my mining, herbalism and skinning guide. I was able to finish the mining guide and herbalism guide before they shut down the beta server, those two guides are already updated. I will do the skinning guide as soon as the servers come back online.
I also browsed through my guides, but it seems most of the vendor bought recipes aren't changed at all. There won't be any change for the rest of the professions with patch 4.0.3a, at least I couldn't find anything.