The flat screens are better and I think there were power plugs, the first I've seen so far. I'm not the biggest fan of the electronically dimmed windows since you can't make it completely opaque. Other than that no big changes as far as I remember.
Overall I'm a fan of the Dreamliner (only 2 flights, a roundtrip on Norwegian). Seats were reasonably comfortable, even for economy on a budget airline. The big windows are nice. It was definitely quieter and (placebo?) the air did feel less gross.
Downsides: The arm rest didn't fully rise out of the way, so it's no good for sleeping on your partner's shoulder. The not-fully-dimming windows were a little annoying, but also really neat.