It could just be not yet implemented (very possible) but has anyone seen it or have any ideas?
All known information about the Unborn Val'kyr
A new battle pet wanders the vast expanse of Northrend in patch 5.3. The elusive Unborn Val'kyr awaits! pic.twitter.com/2SaZzuoDdl
@Proffessor_Oak Less elusive than the Minfernal. The spawning is certainly unique on her though. ;)
Whispers from pet tamers in the north have spread word of an elusive new battle pet that can be found in the frozen tundras of Northrend. The Unborn Val'kyr awaits.
4. Three unassigned spells have appeared alongside the pet: http://ptr.wowdb.com/spells/142255-unborn-ressurection and http://ptr.wowdb.com/spells/142256-unborn-valkyr and http://ptr.wowdb.com/spells/142258-unborn-valkyr-focus