Theyre capable of mixing different animations for individual limbs together, and my recommendation would be to mix the Priest floating animations with the 2h Idle animation.
As for weapon effects, I think its about time to iterate on the weapon trail effects to give them more of a visual flair. Imagine for frost DKs, consuming a Killing Machine proc gives our slash an icy after effect.
https://imgur.com/D9G2CBE