When the long wait times for character copies subsided, I transfered my level forty shaman to the test realm in order to check out the improved experience gains. The good news is that the change was certainly noticeable. While I don't have any hard data, with full rested experience, I was able to gain about three levels in just a few hours while doing quests that were mostly green to me. The bad news is that I've been spoiled by the new experience rate and have been unable to continue leveling my alts on the live server.
Have you experienced anything similar? Are your alts being neglected until 2.3 comes out?