Well, the old M&B thead is wayyy too out of date regarding this topic, so I mind as well create a custom thread just for M&B2: Bannerlord.
Official dev blog: https://www.taleworlds.com/en/Games/Bannerlord/Blog
Confirmed changes coming in Bannerlord:
Bannerlord takes place 200 years before the events of the original game, Warband.
- Calradia is still standing but at this point it's in it's last days, and the fringes of the empire has fraxured into the 5 factions that would later eventually become the 5 (6, though the Sarrandis weren't added until Warband) primary nations of Warband.
- No Sarranids this time, as they have not yet migrated to Calradia. The Calradian empire itself takes the place of the missing 6th faction in this installment.
Popular mods are being incorporated into the new game.
- Diplomacy mod was specifically named as one of them.
The actual castles are now somewhat destructible during sieges.
- Only the gates so far have been shown to be destroyed.
New minigames have been added to the tavern.
- Marbles has been shown as one of them.
Crafting is coming! Visual customization for weapons! (and potentially armor)
- The new video demonstrates the ability to choose how your weapon appears. For swords, you can swap out the blade, guard, hilt, and pommel.
Replay mode
- A cinematic tool that allows one to make movies of said replays with camera pans and so forth.