After restarting the game, the "Off" button was suddenly replaced with an "On" button. When did they update it? Never mind.
In the game creation window, the hero selection is terrible. It's just a list of icons and names. There's no special ability information, or even affinity. But there are some good ideas: you can change the victory conditions in the game being created (maps have default victory conditions; you can make it, for example, "defeat all"). You can also customize the teams (this was sorely lacking in the fifth game, and probably everywhere else). There are also a couple of other settings, like trading with allies. Overall, the multiplayer options are promising.
In the game: well, the interface is still annoying. It's as clunky as it was in that video. An interesting detail: in the description of the Hall of Heroes building, it says that it allows you to hire and (!) resurrect heroes. I wonder how that's implemented.
And yes. I looked at the window for the hero I hired. I took Turis, expecting her to be a specialist in cavalry, like in the third game. But it turns out... she's not a specialist at all. In the sense that I don't see where the heroes' specializations are, or if they even exist. If the heroes don't have specializations, that's extremely disappointing.
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Ha-ha, but no, the heroes do have specializations. And the specializations are displayed in the hero hiring window in the tavern. In particular, Turis has an increased growth rate for cavalry and cuirassiers (presumably, an upgrade). Well, at least that's something.