I would vote no unless someone could give enough info for me to change my mind.
Stovahkiin wrote: ».. why?
If the dlc zone was full of rainbows and if the unicorn could shoot lazers from its horn while you're riding it as heavy metal music Erasure plays in the background. Then yes. So much yes.
https://www.youtube.com/watch?v=CC_Y4zOUdcI 
Funny how folks can't handle a horse with a horn. Yet mounts exist that have nothing to do with lore and second look way more redicilous.
I mean come to think of it why ARE unicorns even mythical? It's just a skinny Rhino / horse with a horn right. Yep giraffes exist and they a giant moose leopard with a 40foot neck. Way less realistic.