I was flying around the wetlands farm:
ImageShack® - Online Photo and Video Hosting
(location)
and noticed that there was now a gate blocking the tunnel to nowhere so that people could not go through on their flying mounts.
ImageShack® - Online Photo and Video Hosting
(the gate)
Being a mage, I decided to try and blink through it, as that sometimes works with gates, and it did. However, you have to be about 20 yards away from the gate, similar to the placement of my mage in the picture. If it doesn't work at first, keep trying and remember to be a little bit away from the gate. Eventually, you can go through the tunnel and fly underground, which leads to what I'm sure are many possibilities.
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting