The patch notes for the patch 5.1 PTR have now been updated to include a large number of class changes, mostly spell fixes and the like, including several fixes to druids' Symbiosis. If you recall, several class changes were datamined, but Lead Systems Designer Greg "Ghostcrawler" Street
asserted via twitter that the datamined changes were mostly recent hotfixes, and not PTR changes. These class changes, as they're coming from Blizzard directly, are the correct and proper ones. I'm slightly disappointed there's not more being altered in abilities problematic in PvP, but remain hopeful for more. Remember these aren't final!
Update highlights include:
All mineral nodes will now despawn one minute after they are mined, even if items remain in them.
Class changes for druids, hunters, mages, monks, paladins, priests, rogues and warlocks.
Cooldown timers greater than 5 minutes will now reset between attempts on Challenge Mode dungeons.
Hit the break for the full, updated post!