I checked today and still no new steps with speaking to Bangar. I did notice something particular intriguing about this achievement, though. You can see the steps through GW2 Companion App which uses API to gather the achievement information. Read below for spoilers!
Check in with Bangar at the Eye of the North
Rytlock speaks his mind.
Aurene Versus Jormag.
Crecia weighs in.
Seems to be steps in-between releases. More will be released at some point in the future. Possibly not weekly but in chunks? Also, it could be between ep 4 and 5, ep 5 and 6, etc. all the way to the end of IBS. Remember, Bangar is a permanent addition to the Eye of the North now, so it could be drawn out. Time to speculate!