It seems that everything is largely as expected: 12-speed DuraAce and Ultegra go electronic-only, slightly more range, DuraAce and Ultegra are still only considered road groupsets, no compatibility with older 11-speed levers (unless you have a TT bike), and the smallest cog still has 11 teeth. And I love the moniker “wiredless”, whoever came up with it, deserves a raise!
The new brake calipers indeed look like cousins of my Force eTap calipers, which I reckon is a good thing since these are the best hydraulic brakes on drop bars I have used. Shimano ditching its road-specific rotors in favor of mountain bike rotors is a great idea, too. I love their IceTech MTB rotors. I reckon they still use road-specific brake pads, though, right? (AFAIK Force and 2nd-gen Red eTap AXS disc brakes use the same pads as their 2-pot Level brakes.)