Set sail for the previously unmapped isles of Azeroth. Battle in groups of three as you race against cunning rival intrudersor enemy playersto collect the island's resources. Constantly evolving challenges await as you traverse frozen landscapes near Northrend, open the gates of an abandoned Gilnean castle, navigate a war between elementals and more.
The hexweave bags are still a safe bet unless the new 32 crafting cost is like 10% of them. The one thing I'm more concerned about is the professions squish. This will make the old world items that we've been selling (TBC Dust still sells by 200 stacks easily) only required for Transmog and not leveling. This was a better option for a lot of professions (especially enchanting). Expecting their near-death with the next expansion. :(
Welp, not clear on what to do or what to invest in, but (to me) the Key point professions will be alchemy, inscription and blacksmithing, Alchemy raiders will need flasks and pots, so steady income. Inscription for cosmetic glyphs and trinkets the first two tiers of expansion. Then there is blacksmithing that can make ilvl 300 weapons (and armor) that are lvl 110, pretty much like WoD weapons, so they may sell very well through all expansion.
But every new character made that wants to craft old expansion stuff will have to level using expansion specific materials. Stocking up on profession materials that are already high in demand can be a great idea. This will primarily be materials used to craft the various mounts. Ghost Iron, Trillium, Living Steel, Pyrium etc. are all great candidates to stock up on.

Jewelcrafting, buy/get ores, prospect them, craft blue gems and put in the ah. With all the greens and some Monolite from the scraper or your druid* farmer alt (imagination exercise here if you don't have one yet), you can craft green rings, sell them or just disenchant them, for enchanting mats that can be used for sells enchants or just raw mats.

In a few months only mats will be worth anything. At this point we have people with tens of millions of gold and people with just a few thousands. A flask takes tons of mats to make, and they will sell for well over 10k gold each, so the casual players won't afford them. When people realize that the rich guys will always take buying from the AH over farming their own mats, the prices will go even higher, then casuals will notice how expensive flasks are, and they will pick up alchemy and make more flasks, driving the prices down again.