Apparently there are plans to improve Wolve's Den. It just won't happen till after Heavensward is released.

Q&A at 0:49:50
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