Klaus & Hayley's daughter / son will either be a werewolf, a werewolf hybrid of some sort , or possibly [ if we're lucky ] a entirely new species.
[ Shae is what I've named their daughter ]
The question at hand is what will they be.
Since Vampyre's are the undead and unable to have children it would appear that Kayley's child will not be a Dhampyre [ child of a Vampyre and a human ] but instead a werewolf hybrid of some kind, possibly steaming from the witch genes on Klaus's side..
I am personally hoping for a whole new specie such as a Nagual/Nahual [ Na'well ] to be honest.
[ one that rapidly ages and turns 16 / looks 12 in the first season ]
A Nagual/Nahual is a human being who has the power to magically turn herself / himself into any animal form they desire.
[ a Nagual is believed to use their powers for good or evil according to their personality. ]
A skin-walker is a person with the supernatural ability to turn into any animal he or she desires. Although it is most frequently seen as a coyote, wolf, owl, fox, or crow, it is said to have the power to assume the form of any animal they choose, depending on what kind of abilities they need. Witches use the form for expedient travel or may transform to escape from pursuers.
Abilities of a skin-walker are to shapeship into any animal form they desire, accelerated healing, and animal control telepathy.
Legend has it skinwalkers can have the power to read human thoughts.
They also possess the ability to make any human or animal noise they choose. A skinwalker may use the voice of a relative or the cry of an infant to lure victims out of the safety of their homes.
According to myth, the only way to successfully shoot and kill a skinwalker is with a bullet dipped in white ash.
In the film Mortal Kombat: Annihilation, the Native American warrior Nightwolf acted as a Skin-walker by transforming into a wolf. He calls the technique his 'Animality', the knowledge of which has been passed down through Nightwolf's people over generations. He teaches Liu Kang how to perform it as well, but since Liu Kang becomes a Dragon, the technique seems to vary from person to person.