Yeah, for all industry you draw out the perimeter now, and it fills it in with a suitable texture. It makes most sense with fields, but it's the same mechanic for the rest. There's more industry specialisations now too; timber, grain, livestock, vegetable, textile fibre (cotton), stone mining, coal mining, ore mining, oil drilling... these raw material providers then service general industry - but general industry this time around is divided up into 18 of its own specialisations, each with it's own mix of raw materials that it requires.
Similar story with Office demand. Software, financial services, telecoms, media are also immaterial goods produced by offices and used for production. So for instance Telecoms; the end users are consumers, industry and other offices, it requires software (produced by offices) and electronics, electronics are produced by industry, and that industry uses minerals and plastics... minerals require rock to be mined, and plastics require petrochemicals and chemicals, which in turn require oil, grain and more minerals... so you can see that it all intertwines in a much more plausible fashion than previous vanilla industry.
Overall I really like that, but that assets themselves are a bit crap compared to Industry DLC, and also, you seem to have no control over what your general industry actual is... so where I've got tonnes of oil to spare, I'm still importing most of my petrochemicals because not enough crude>petrochemical industrial units have spawned yet... in C:S1 Industry DLC you had control over extractors and processers, but no we've lost that second stage.
edit: one of the other big changes as far as industry goes, is the way rail cargo works. Rather than trains just spawning at random when someone orders 1t of cargo, you set routes and specify the number of trains available, so it's much, much easier to manage cargo rail traffic than before - once trains start arriving and leaving full, you just add another train to the route. Given how much of my time was spent in C:S1 managing cargo rail infrastructure, this really is a game changer!