Those are unlikely to be real, but the card art is and if you check previous announcement trailers they all have legendary rarity even though that turns out to not be the case when they are revealed. So basically, art is real everything else is unlikely to be real.
Noticed at the beginning of the release video for UG:
(Sorry for the bad quality images - they were blurry when the vid was paused)
In particular, a 4/8 for 3 mana...? That seems strong. It must have a heavy negative text I would imagine?
that 4/8 must be a quest reward, given it's mana cost.
(or a shaman card)
All cards featured in a cinematic trailer are shown as legends. It doesn't mean anything these could be common and rares.
Proof: https://www.youtube.com/watch?v=cKjUgLrDEbI
Here in the Old Gods cinematic the only true legend shown was Hogger, the rest are Rare, Common, Token (for crying out loud), and Epic respectively.
EDIT: Heck even the GVG cinematic had Darkbomb as a 2 mana 4/1 lesson here is never trust cinematics
Those are unlikely to be real, but the card art is and if you check previous announcement trailers they all have legendary rarity even though that turns out to not be the case when they are revealed. So basically, art is real everything else is unlikely to be real.
Uh-huh!
Ok then! :-)