Latest update:

Q: Can you perform fine tune adjustments to PvP and have Hot Fixes with a higher frequency?
A: We'd like to proactively make adjustments to PvP specific values as often as possible.
Q: Can you tell us about any plans in the future for additions or expansions to the Wolves' Den?
A: A lot of players are getting involved with Frontline, and even players who previously were not interested in PvP are participating in greater numbers. The current concept of the Wolves' Den is a place for people who want to improve themselves and become even stronger in PvP. We'll be making adjustments to Frontline including the addition of new maps and rules, and we'd like to see more players motivated to get better at PvP. However, if we make adjustments to both Frontline and Wolves' Den at the same time, it would 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.
It looks like their focus is on the Frontline only atm. This update also match to YoshiP's interview with Famitsu.