Besides the better cpu and screen, i'm not sure if it's a big of an upgrade depending on how you're looking at it.
true it's probably not a huge upgrade, i currently have the 256gb air 2011 version. I've ran into the hdmi problem quite a few times on the air. the screen is mainly what i'm going for. If I sell the air for around $1000, the difference will be close to $500....eh now I'm regretting upgrading for that price difference.