1) will there be the ability to comment on/below articles?
I'd say it's an important capability:
could be limited to forum members; but using other options, e.g. disqus as you say, could draw in new people.
2) will wiki-type pages be a possibility? (apologies if discussed before, I havent reread thread...)
a very good example of where wiki-style editing would have been of great help was Steven Avery's fully free software utilities for biz use
Over a period of years, no-one is going to maintain a list like that.
A full wiki would not be necessary, but something enabling multiple editors could help keep something like that alive and up-to-date.
if comments were possible, one moderator could give other active posters moderator status. Something along those lines allowing more input would be of help.