In patch 4.1, this will stand no longer. The Wowhead blog is reporting the Wintersaber grind is being turned into a series of daily quests that put you in charge of the care and feeding of a Winterspring Cub on the PTR. After 20 days worth of dailies which earn you Winterspring Cub Whiskers, you'll be able to turn in the They Grow Up So Fast quest for your very own set of reins. In addition, you can buy a Winterspring Cub permapet from a vendor in Everlook. It's Bind on Equip and sold by a neutral vendor, so even Horde and Bloodsail Admirals can get thier hands on it.