Zarhym has confirmed on the official forums that a new heirloom item called Tome of Cold Weather Flight is planned to be added in patch 3.2 that allows your alts to learn Cold Weather Flying at level 68. You can only purchase the tome with a level 80 character on the same realm, faction and account to mail to your alts. Each tome costs 1,000 gold and is consumed once it's used. "It's a small perk for those who have reached level 80 and like leveling new races or classes," Zarhym said.

As always, the functionality of the tome may change as testing progresses. You can discuss the topic in this thread in our general forum and read Zarhym's original post below.

Just to confirm, Tome of Cold Weather Flight is actually a new heirloom item planned to go into patch 3.2. At level 80 players can buy this heirloom item from the Cold Weather Flying Trainer in Dalaran for 1,000 gold and send it to an alt of the same realm, faction and account. The tome can be used to learn Cold Weather Flying at level 68, consuming the tome in the process.

Please note this feature is not yet in the newest version of the public test realm patch notes updated today. The item and its functionality are subject to change during the testing process.

PTR Patch Notes: http://forums.worldofwarcraft.com/thread.html?topicId=17899680776&sid=1