Back in patch 4.2, there were green versions of the the fire bird mounts. I forget if there was a ground version or if there was only a flying version of the green fire bird. Well it looks like an icon was added for the raven lord ground mount in this latest build. There are also some green revisions of abilities like DW tentacles, which is interesting. I know there are also the new warlock green fire spells, however, i believe these are unrelated.
ability_mount_fireravengodmountgreen
I'm not sure how to post a pic of the image so here is the link to the wowhead news post, scroll down.
http://www.wowhead.com/news=210355/5...ents-3d-models