Upon request from Rhapture to check out the Snow Cub on the beta, I also decided to get some video of the (new?) crosshair cursor when hovering over a few (not all) critters.
Like the video description says, left and right clicking only yields an error message atm (regardless if I have a vanity pet out or not). I can still attack and kill these critters, but upon agro'ing them the crosshair icon turns back into the standard sword icon.
I'm not sure what's intended with the change in cursor icons, but hopefully it's related to Pet Battles and the like. I wouldn't mind capturing a Snow Cub! ;)
Side note: The Snow Cub is a common critter wandering all over Dun Morogh on the beta.