Here's my thing as well:

SE mislead those that are really enjoying PvP. They never called it Wolves Den gear, they never called it Wolves Den rank. It's called PvP gear and PvP rank. The patch that introduced 10 ranks and the PvP animal gear also came with notes from Yoshi and devs stating that Frontlines will be discussed soon, please look forward to it. Why would they introduce new ranks and new gear while teasing Frontlines that have been teased for a while and not explain that it will not be useable in frontlines. Furthermore, the animal gear was shown in a live letter with Frontlines written on it. It's easy to see how you can come to the conclusion that it will be used in Frontlines. So, enjoying pvp already I start getting extra pumped and start queueing every day. A) because I like it and B) because I wanted an advantage in Frontlines. Some only did wolves den even though they didn't like it just to prep for Frontlines.