Sword Art Online Code Register Pre-Registration just went live today and players can registering by logging in their BandaiNamco accounts. The game will be available for both Android and iOS. Looks a bit Brave Frontier'ish.
Updated Register Link and Country Selecting
Registration is in English, hard to fail really.
New Account Register: Link (Select Japan Country Region of Residence)
Game Site: Link
Pre-Registration iOS: Link
Pre-Registration Android: Link