This really isn't surprising. Arenanet has been including positive portrayals of minority characters for awhile, now. In the first season of the Living Story, two of the main story characters were lesbians. When you initiate the final assault against Scarlet Briar, a character known as Marjory Delaqua becomes injured. Enraged, the mesmer called Kasmeer Meade uses her magic to distract Scarlet so the main hero can defeat her.
As Marjory lay potentially dying, Kasmeer kisses her.
There are other references throughout the first season of the story where Marjory and Kasmeer hint that their relationship is more than just a casual friendship.