Plenty of gameplay things have changed -- more on that in a minute -- but one thing almost immediately transformed the game for me. I was killing my fourth Kobold Vermin (sorry guys, I'm taking those candles) by auto-attacking it and waiting impatiently for my lone ability to light up, when it struck me: This was going to be slow. Really, really slow. And, after another minute, I realized that was okay.
Most profitable professions are considered to be Herbalism and Enchanting in pair. You can have Enchanting only for Disenchanting skill, it will bring decent gold. Consider the fact of disenchanting all soulbound armor, not just selling them to a vendor, but I do not recommend to disenchant any kind of weapons, it is more profitable to sell it to a merchant if it is a soulbound item, or sell it on auction house if it is BoE (bind on equip).
I'm happy to see them really committing to this. I didn't think I would be all that interested, but I will sure give it a go. Personally I wouldn't mind quality of life improvements and most of my friend don't really care for a 100% authentic vanilla experience but they want the old zones and world, a game world pre-Cataclysm but have no requirement for it being "authentic" to World of Warcraft Patch 1.12.2.