I have the "master plan" addon and I see a bunch of missions of interest.
The most I am curious about are the Highmaul missions...how often do you get them? I did my last one 7 days ago and havent gotten one since. I have way more the 15 heroic boss kills in highmaul

2 weeks from the time you started the mission.

15 Heroic HM kills = mythic cache every 2 weeks

I think BRF is 21 heroic kills, don't quote me on this though as I haven't gotten my Mythic BRF cache yet (doesnt share the same CD as HM cache iirc)

This post was edited by straightedgerevenge on Feb 21 2015 05:53pm

No official post on it (21 kills), but the BRF cache is coming with 6.1

This post was edited by nlin on Feb 21 2015 10:50pm

I saw people with mythic BRF gear before mythic was released. So I'm pretty sure you can get mythic caches already.

I might be wrong but I was looking at EU armory and saw a bunch.

This post was edited by DeanofDazzle on Feb 21 2015 11:31pm

BMAH.

Ahh that makes sense.