JC Panthers: Instead of breaking them all down like I did with the golem, I'll just note that currently on my server the Orb of Mystery and the Living Steel combined cost 36,000g. All of the panthers, except the Onyx, sell for 32,000g. A loss of 4,000g/unit, not including the gems. Once we factor those in, at a mean value of ~200g/unit, the loss per Panther jumps to 8,000g.
Blacksmith, Tailoring, Leatherworking all can create their own BoP gear like before with Blacksmithing able to potentially create indestructible versions and can repair in the field instantly (not that big), while Tailoring gets specific cloak enchants with some unique effects like not being able to to be dazed which is going to be very useful for Tailoring/Herbalists.
For what it's worth, I like the leveling changes, but I also think that the profession changes are beneficial. Once they removed the utility of most professions; it became more of a hobby. Crafting should be fun. When it gave perks, it was fun, but Blizz, correctly, decided that it was creating forced gameplay (min/maxers always picked certain profs). So they changed it. Well when a prof doesn't give you any gameplay perks AND it's tedious...it's not fun. Especially if you're starting from scratch and outleveling your profs because you're blowing through levels so quickly.
As with Jewelcrafting, Alchemy is a bit more nuanced than looking at hourly rates. Flasks will provide you with a good baseline, but if you carefully watch the market and plan your transmutes with market trends, you could see huge gains like JC. Assuming you are focusing only on selling Flasks, you will make around 2138 gold/hour if you are also an Herbalist.
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.)