It all depends on how much activity arises from the community. Usually a thread pops us and picks up a lot of activity. We either notice the activity or few members request a section for it. If the new section grows, we'll bump it up. If the section loses its activity, we downsize it.
In other words, feel free to encourage active discussions about WoW. If it goes well, a section may be on its way. So far, no one took the initiative to make WoW active here.