Sign-ups on in-game calendar are now open for the Heroic Argus Kill, AotC chieve and mount.
You can find more information here:
The TLDR is be 930+ (lowered ilvl requirement!) and able to join for Thursday evening to roll at 7:50pm, and then join the group sometime between 8-9pm server.
We'll most likely have you die on pull, and then in final phase collect the orbs to give the raid a buff (still dead).
Any questions, see Terve!