We have disabled the use of –email and –password command-line parameters for the Guild Wars 2 client. These options involved storing account credentials in an unsecure way that could result in security and privacy risks. If you wish to expedite access to your game account, you may use the “Remember Account Name” and/or “Remember Password” options in the login window.
Communications Manager: ArenaNet
Fansite & Guild Relations; In-Game Events; Community Showcase Live