Yes.
Do a search on arena caps. More than a few times Skuzzy has answered how they work and why. Simply put, it's a way to get both of the late war arenas populated as evenly as possible...and the limits are on an automated timed setting.
The underlying cause of the arena split is to remove the caustic environment the large single arena created. Too many players in one arena creates an unhealthy environment.The arena caps were enabled again, as the arena numbers were approaching the healthy environment limits. No matter what you think, we have numbers proving a large arena will not allow HTC to continue to grow.We have remained open for suggestions to solve the problem. A large fixed arena size is not an option.