This is a 13" 16:9 screen. A little smaller than the current 13.6" 16:10 MacBook Air in display size but not really any more portable. Weight is the same as the 13.6" MacBook Air.
Yes. I think Air is a better buy if you are going to have a "laptop". I wish it was lot lighter if I am losing features against MacBook Air.
Don't think it's 16:9, just lower PPI than the air -- Neo: 2408x1506, Air: 2560x1664.