I imagine it'll mostly just be including COK stuff & a few paragraphs of errata.
They claim there'll be 14 armies in the core rulebook with an expansion book coming out a couple of months afterwards with 12 more for a total of 26 factions. We know that'll include the new Northern Alliance faction and the book with 12 more will probably be stuff from Uncharted Empires. The new core rulebook should be 380 pages. I think that's significantly thicker than the existing one.
So new core rulebook out in October. That'll be something to look forwards to.
They waste page space. The circles on their own do nothing because they're all the same colour and shape. With only the lettered abbreviations differentiating between them they might as well have stuck to the old linear layout which made sense. It wasn't confusing or difficult to read. Now if they'd made the circles different colours or used icons or something it would help what they're trying to achieve here. At that point they might as well use cards.
Scaling unit upgrades with unit size makes sense. Probably being done with magic items too.