I've always said if they could be priests, they should be pallies.
True but we have seen ideas from hearthstone added to WoW such as Sir Finley or the entire Tortallan Race. And this idea isnt completely out there gnomes have been around light worshiping races probably long enough to become curious and find a way to use it. Or it could mean nothing because there is also plenty of other things that never made it out of hearthstone (for good reason).