First, I'll have to point what is bad according to me:
Chrome gold and silver painted weapons and helmets doesn't do for a long-lasting use.
Bullet Helmets don't seem to be back (so why would there have been bows?).
Modularity of the main castle is based on pegs only, not hinges.
Little sets won't have modular abilities, since no connection pegs/holes show off on pics.
No civilians, and not enough women too.
No stairs to the throne room.
Portcullis is too close to the front gatehouse wall for people to be able to walk between them.
I doubt that "wooden" inverted slopes will be strong enough to support crenelation.
Crenelation height hasn't been put up by 1M, although the gap has been kept to 2M wide.
What the heck is that ugh... green baby Dragon? Where are the owl, eagle or so?
Eventually, I'll point out what is good:
The throne tower is less airy, far more consistent that what could have been seen on 6090.
The peg modularity of the modules provide us with not only pegs at the base, but on top too.
Weapons will come in various coulours.
Buildings are plate based.
Only human factions (for the first to come, but, if based on the previous "Castle" line, we expect four, we could see some more, such as human, elvish, zombie or whatever.)
Portcullis is better than the previous "barbecue grill" we had to get for too long now, better fit for those who preffered plate-based ones. In fact, first time I saw pics of the set, I assumed it was built over assembled prison "windows". (planning to do that for a little door portcullis in a next MOC).
The drawbridge mechanism is tending to be (or trying, at least) more realistic, it's not perfect, but a good way on since the KCS.
Grays are well mixed in the buildings.
To finish, I plan to buy at least one of each, plus, some of the littles to save MISB and pull them out as a trade counterpart some years later (as I did with "castle" wizard and soldier).
I anticipate that the two soldiers with catapult and prison transport will be among the preferred little set here for parts and/or army builder, they will be nice starters to get kids into castle. Some had heart attack seeing the dark gray or dark green soft sword and assuming at first glance it was black.
When built, my octagonal tower will probably see their quarter-octagon bricks get over to the outside, instead of leaving this space (little cliffs) on the sides.
Thank you all ambassadors for spreading our words and thoughs to Lego. I think you had a main role in such a return to basics in medieval line and this shouldn't be forgotten nor minored.
Thanks to lego to have this done, in the end, you won't regret it.