Indeed the G46VW comes without optical drive. You need to buy a external USB optical drive when you want to install something from a cd / dvd / Bluray.
Given the G46VW's smaller size, Asus decided it would be best to exclude an optical drive, and that's probably fine with so many PC gamers relying on digital services today.
And here the source:http://www.techspot.com/news/50612-asus-reveals-14-inch-rog-g46vw-gaming-notebook-with-i7-gtx-660m.html
I also checked the Asus site and when checking the specifications I found this:
500GB 5400/7200 With 128 G SSD
750GB 5400/7200 With 128 G SSD
750GB 7200 With 8 GB SSH
1TB 5400 With 128 G SSD Optical DriveBlu-Ray DVD Combo
Think they made a small mistake on the webby and very confusing for everyone.