Screenshots of the new Epic Mounts

[Darian]

Blizzard has stated you will be able to turn in a current level 60 mount in exchange for one of the new ones.

It'd stand to reason that they're adding new items but not changing the old ones.  So yes, you can buy a level 60 mount before the patch and hang onto it.  Limited Edition.
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I bet that'll drive up the cost of gold on eBay for a couple of weeks...