Power efficiency is nice but the number doesn't change that much, you need 10 chips (600$?) to outmatch a 280x (300$?), yes power is the key but this is not "a game changer" just a shift in power consumption, the kh numbers are pretty much the same.
Du(al)-Coin mode up to 1.75G/s BTC Hash Rate + 60K/s LTC Hash Rate, or up to 2.25G/s BTC HashRate + 38K LTC Hash Rate
comes with 1.75GH/s of BTC hash rate as well..when running 60Kh/S LTC, doubt one 280x can do that?
