5) Specialization, Perks and Titles: Immersion. Simple as that. I think Blizzard underestimates people's desire to feel/look a certain way. Having an engineer with the Tinker title, and maybe some glove, apron and goggle cosmetic mogs. The blacksmith who specializes in armor that gives him access to higher quality goods. The enchanter who is so adept that they can enchant tertiary stuff onto off-pieces. Make these people feel like the profession they want.
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.)