The armory has changed drastically from its original interpretation and implementation, adding features over time that give players a more cohesive out-of-game experience. What is most interesting are the potential tie-ins later on with the previously announced WoW APIs coming down the pipe in the near future; we are still unsure of the amount of data that developers will be able to access from the WoW armory. I would not be surprised to see collected pet and mount data also being part of that package.
We've got a pretty full-featured armory at this point. What other types of data do you think the armory could or should provide? Perhaps next we'll see a tabard and title tab, showing players' collected tabards and a scroll list of titles earned. The sky is the limit, apparently.