Well, you can read a bit here about how overlap with other IF sites is not necessarily seen as a negative: Metasite for submitting to all three major community sites?
But to answer your question, my understanding is that IFWiki was intended as a place to organize and link to community knowledge, particularly about craft, theory, and history. It’s also a glossary and reference for things like e.g. what an interpreter is, what the various interpreters are, what are common tropes and puzzle types in IF, etc. There’s also info about community members and their roles–who organized which competitions, who writes reviews and where to find them, where to find a particular member’s web site, etc.
Ok. I’m not sure whether to wait for more people to chime in, or to just go ahead and set something up. One thing I’d need to figure out is whether to try to combine it with the old “Current Events” page, or just start a new page, in the new format that includes a link to the old one. The latter would be easier i think, especially since the focus has basically narrowed from events of various kinds to competition news. So maybe the new page should have a different name?
That sounds good to me. As far as I’m concerned, anybody who wants can go for it. Not that I have any sort of authority as far as IFWiki is concerned. 