Rank 3 is terrible design, if they we're most open about how they drop etc. I, as a avid LW collector (Yes I have all recipes in-game but IIRC 1 from vanilla, few from TBC that was removed due to stupid design), and I still dont have all rank3 from LW despite plenty of runs through the 5 mans for em...Ill just wait for next exp or w/e and stealth runs.
S Sanguino Alliance Sanguino Horde Sargeras Alliance Sargeras Horde Saurfang Alliance Saurfang Horde Scarshield Legion Alliance Scarshield Legion Horde Sen'jin Alliance Sen'jin Horde Shadowsong Alliance Shadowsong Horde Shattered Halls Alliance Shattered Halls Horde Shattered Hand Alliance Shattered Hand Horde Shattrath Alliance Shattrath Horde Shen'dralar Alliance Shen'dralar Horde Silvermoon Alliance Silvermoon Horde Sinstralis Alliance Sinstralis Horde Skullcrusher Alliance Skullcrusher Horde Spinebreaker Alliance Spinebreaker Horde Sporeggar Alliance Sporeggar Horde Steamwheedle Cartel Alliance Steamwheedle Cartel Horde Stormrage Alliance Stormrage Horde Stormreaver Alliance Stormreaver Horde Stormscale Alliance Stormscale Horde Sunstrider Alliance Sunstrider Horde Suramar Alliance Suramar Horde Sylvanas Alliance Sylvanas Horde
There's a few profession crafted pets in BfA on the horizon - Battle for Azeroth Tailoring is getting a Hot Air Balloon style pet, and BfA Alchemy looks to be getting a brand new Transmute Meat to Pet. There are some mount buff consumables from both BfA Leatherworking in the form of a mount barding, and Blacksmithing in Battle for Azeroth will be able to craft Stirrups and Hoofplates to increase mount speed and allow you to interact with things while mounted.
Mythic+ rewards will also go up by 30 item levels; however, during the first week of Season 2, rewards from end-of-run chests will be capped at Mythic 6 quality (item level 385), and the chest you open next week will contain Season 1 rewards if you do a Mythic+ run this week. (So, for example, if you do a Mythic 10 during the final week of Season 1, you’ll get a Season 1 item level 380 piece and 60 Residuum from your first Season 2 chest.)