It looks like Rogues may have something to look forward to in patch 3.3. According to Greg "Ghostcrawler" Street, "We have a change for Vanish in place for 3.3. You will get to try it out soon (tm)." He did warn players, however, that Rogues may receive some sort of nerf elsewhere if the Vanish change provides too significant a buff to the class.

Slorkuz quoted Ghostcrawler in a separate thread on the topic. "We have seen quite a bit of feedback regarding this ability for a while now, and wanted to give you a small heads up and let you know that we have not forgotten about you," Slorkus said.