PvE/PvP freeps will gain use of special pve only class specific outfits to distinguish themselves from pvp only freeps.
PvP only freeps will advance through ranking much like creepside. Stats, skills, traits, and outfits will raise with rank.
The idea is to balance pvmp while maintaining populations per side. The only way I can see doing that is to open up the ability to advance through rank vs gear grind for freepside.