It looks like White Celestia has been spotted over on Taobao by MrPony on MLP Arena. One thing to note: These Toys R' Us toys are considered collectors items. We do know we as a community played a pretty huge part in these things popping up, so I guess the label fits doesn't it? I wonder what they gave her for speaking lines?
Now we just need the rest of the set to show up! I'm still going to invade the world with my glowy Zecora army.