At least for the alpha period the intended audience is definitely going to be folks familiar with the series while the primer is meant for someone that at has an understanding of generic fantasy to get them pointed in the right direction so they could create some Lady or soldier and go from there knowing that elves, orcs and D&D style magic weren't a thing.
The wiki itself will definitely grow as things progress, especially once officially open and get people in so I know where the weak points are for play... and I also am not above bribing players with Luck/XP for wiki work.
I do not intend for the wiki to be another Wheel of Time encyclopedia though. In my opinion that is the wrong place to put effort where such good, easily searchable resources already exist and that time could instead be spent on the game itself.
Seriously, I did a random wheel of time question into google. "What type of hats do they wear in cairhien" and got several responses. I can't beat that, nor do I want to.