Would imagine there wouldn't be any new guides. What's to guide? Patch 5.1 notes:

Desynthesis can no longer fail, regardless of your desynthesis level.
* The requirements to unlock desynthesis have not been changed.
The combined total level limit for desynthesis has been removed.
As a result of this change, desynthesis levels can no longer go down, and it is possible to level desynthesis to maximum for all crafting classes.