GWJ guild activity is now minimal, the information below is now suspect at best.
GWJ Guild/Circle launch info:
The GWJ guild is The Impure of the Dominion faction on the Avatus server. Contact ranalin or pretty much any GWJ on Avatus for an invite.
Wolfstar76 is organizing an Exile Circle on Stormtalon, so contact him in game at "Wolfstar" for a circle invite.
Also on Stormtalon, it looks like many Goodgers are joining the guilds:
If you're interested in joining Grievance, write a post in their "Apply here to join Grievance in Wildstar" forum. Great group of folks and very active.
Gamescom and Pax Prime saw the announcement of another MMO, this one currently planning on releasing as a premium model.
I kind of dig the graphical style but have my doubts about its ability to gain mind share.
Beta sign up at their website linked above.
Dev walk through video: