The Volcano bug has been fixed! Feel free to return to Searing Gorge/Burning Steppes and capture ad nausium.
Several other abilities seem to be creating errors every once-n-a-while. Leap and Death Coil are two that I can pull off the top of my head. (What they were doing on the top of my head, I have no idea...
The Sack of Pet Supplies now contain a junk item along with the pet supplies. The big ticket junk item appears to be the Exquisite Murloc Collar which is good for 50g (but, sadly, doesn't appear to be useable, even on Murlocs).
While I don't know what the exact conditions that cause this are, higher-level pets that you capture are "leveled-down" to the highest level of pet on your team. (i.e. you have a team with 2 level 10 pets and 1 level 9 pet. You manage to capture a level 12 pet. The level 12 pet will be "leveled down" to level 10 in your pet journal.) This is intended as there were new functions included this.