I'm not sure when this change actually went live, but I've noticed over the last week or so that I've teleported into guilds on a couple of different occasions, including a guild in Galadon and one of the Imperial guilds (which did have a guild guard present).

Seemed odd to me, and I didn't think that was possible before. But Paladins don't get teleport, so I don't have that much experience bouncing around like that.. maybe it's been doable all along.