Judging by the response to the Herald of the Titans sign-up thread, I get the feeling this event has generated a lot of buzz about it. My bitty hunter, Gimmlette, has passed level 20.
I'm one of those old school people who doesn't care for heirlooms and likes to actually quest and get gear. With the Darkmoon Faire from last week, once I obtained the buff from the carousel, levels came very quickly. Even without the buff, it's not like it was.
If you have any interest in obtaining the achievement, Herald of the Titans, you should read Tarsan's forum post. It appears we have all classes covered, so don't ask me what we need. We have a number of people leveling hybrid classes so we will have the right number of tanks, healers and dps for runs. The goal is do our first run in December, to coincide with our 10th anniversary week. You have time to level and we will start running people through Ulduar for gear in October. You can probably count on a run a week.
For people who aren't me, don't forget the heirloom vendor in the guild hall.
You also might want to take a look for those pieces you don't have for transmog purposes. There are also shirts, mounts and pets which are only available through this vendor.
It's exciting to see so many people interested in very much Legacy content. If you have questions about this event, just ask myself or Tarsan. We'll be happy to get you going.