ArenaNet has just made Guild Wars 2 Free To Play.
“Today we’re happy to announce that the Guild Wars 2 core game is available for everyone to play for free. With Guild Wars 2: Heart of Thorns™ launching soon, there’s no better time to introduce the game to your friends.“
There are some differences between free and paid accounts. More info here.
Click here to sign up for a free account and download the client.