Agree as well. I would love to have their costumes available as a pack on the Crown Store. But I also know they would be difficult to replicate, what with no capes and all (can't wait until the day we can use Capes, honestly...haha).
and i wish they would make all the apparel more detailed coz sometimes on an armor i see fur on the neck side but it looks like drawn on the armor or stamped on, i want it to actually look alive and coming out of the armor u know what i mean.
They already confirmed/teased that they will indeed be releasing the cinematic costumes on ESO live a few weeks back. They even showed concept art for the gender variations. (see below)