In an interview with GameSpot, World of Warcraft Vice-President Holly Longdale spoke about the recent addition of tendies to microtransaction bundles in the store.
Full GameSpot Interview
Longdale mentioned that, while there have been some tendies added to a couple of bundles in the store, the Trading always has been and «will continue to be» a way to reward players for playing, not focused on microtransactions. The additions have only been experiments to help those players who don't have time to complete their monthly Trading Post grind but still don't want to miss out on any reward.