It seems like the wiki feature was added, but I can't figure out how to add/access it. I am running v1.3.0.beta3
Click on the ... on the post, then the wrench, then Wiki
doh! now I see it... only when logged in as a Moderator or higher?
I think it's staff only
Yes, it is a staff (maybe TL 4) action only.
TL 4 cannot wiki posts (or at least it isn't documented that they can)
The code says TL 4 can wiki posts:
Just tested, Same as Staff, Trust Level 4 members can make a post into a wiki
It gives the post a different background color and the wiki icon shows
In addition to Post abilities, they also have Topic abilities