I've been playing with Prismic.io during this beta period and think it looks like an awesome product with great potential, but I just can't bring myself to actually use the writing side of it for any length of time.

Is there a way to turn off all the skeuomorphic design elements? Paper background? Lots of sliding panels, it's really hard to navigate around and very busy, even on a big screen. I think they need to completely cut it back and simplify, and I'd use it in a heartbeat.

The API based separation is a good idea for real sites (vs blogs), I think it will catch on and is a much better design than the all in one CMS design behind things like Wordpress, Drupal or Ghost.