We will be starting Mythic Prog this week! Check the raid forums for a post from Mass about strat guides etc!
Also don't forget there are quite a few things that will be GONE when pre-patch/BFA hits. This includes, but is not limited to:
FIRST AID. If you want the achievements get them done ASAP
Mage Tower Appearances (all other appearances are supposedly staying)
Brawlers Guild Legion Edition
Super EZ Pet Charm farming