Q&A continued:

become a bit too fragmented and we're concerned that matching might become difficult. For this reason, we'd like to focus on Frontline first and once the number of these motivated players increases further we'd then like to add rewards, rankings, and a season system to the Wolves' Den. We'd like to proceed carefully so that those players who are really interested in PvP because of Frontline aren't discouraged because they try the Wolves' Den and get defeated immediately.

Source: http://forum.square-enix.com/ffxiv/t...809-11-2014%29