Previews are out. Looks like they got 2 hours to play at some point partway through the game.
They've done a good job of making you feel like you're at Hogwarts, there's a decent amount of casual magic around to help sell the atmosphere (a topiary in the shape of a dragon moves its head around, watering cans hover and spray water, you can animate the statues in a fountain, etc).
There's a day/night cycle, but it's a case of "they're here during the day, they're either there during the night or they're asleep so you can't see them - no 'they're there in the morning, they're somewhere else in the afternoon'.
You can pet cats.
Cons people are noting are things like popup issues, broom flight control looked a little clunky in tight spaces, some (not all) NPCs apparently looked frozen or at very low FPS until you got near them, they seem to rely on scripted encounters over instead programming people to move around on a schedule, open world's a bit empty.
But overall, previews were very positive. Of course, that might be skewed due to inviting mega fans to them, so we'll see how it goes with reviews in a week or two.