**Problem seems to be resolved now as of 7/17, old message is below** Various games not just gw2 are experiencing massive lag. From what I read an external company, is being DDoS. This company receives data from several games, so GW2, Wildstar, and other games are being affected this issue.
Message From Anet:
"Sorry all, we want you back in #GW2 and we're working on that! It's an outside attack on the servers, so hang in there with us. ~RB2"
Updates: 1) Someone claiming to be the DDoS has taken over a twitter account and is talking to people via it. Naming the games he\she took down. 2) From Anet, "Sorry about the connectivity issues, it's not the Ley Lines or Scarlet. We're still working on it. Thanks for your continued patience!"