I'm almost positive they're not grandfathered. Simply too many on US Auction Houses. But they are very rare. Then again I kinda hope I'm wrong. I've probably got 20 in my gbanks.
Saw one of these on Kel'Thuzad horde AH for 100g, but I only have like 10g on that realm (and no high levels), so I educated the seller on the value of the sword :3