If the j/gh ratio is real, this is gonna be a game changer!

it wont be. guarenteed thats at the lowest voltage/frequency, and probably for just the chip (doesnt include regulator loss, PSU loss, other power draws like a controller/fan)
realisticlaly in a final product, this would probably range 0.28W-0.50W depending on settings (ie: similar to the Bitmain chip)
Agreed, looks extremely similar power consumption to the S5's chip on sha256 mode. The scrypt mode looks more appealing, and we don't yet know what we'll be able to do in dual mining modes. If its anything like the gen 1 chips then I don't think many people will dual mine.