Just today ASUS had an event in home country Taiwan that allowed 2000 people to have their hands on the Zenfone 2, and prices have been confirmed.
The most high-end version with 4GB ram is TW$8990, which is around US$285 and AU$369. (Unfortunately AUD is really low at the moment)
The cheapest version is TW$4990 (AU$205), it only comes with a 5" 720p screen and last gen processor.
The $5990 (AU$246) version comes with a 5.5" 720p screen, and the $6990 (AU$287) one comes with a 5.5" FHD screen, which is the 2GB high-end version.
To @scrimshaw, fortunately PhoneArena's info was wrong in so many ways.
Then again, this is selling in ASUS' home country so maybe the prices are lower, but I don't think it's going to be too different for other countries.
I reckon the $287 model will be AU$350 because….australia tax!