So this is the first official, real, confirmation I've seen of M&B 2, so far. In the first (0) edition of PC Gamer Digital, which can be had for free on Steam, TaleWorlds producer and designer Mikail Yazbeck confirmed that while he was finishing up development on With Fire and Sword, he was also beginning development on Mount&Blade 2. Download it and check it out! I can't wait!
EDIT:
Bannerlord 2 was presented at Gamescom in Cologne just recently.
The Engine:
https://www.youtube.com/watch?v=w66nHR7GTF4
Gameplay:
https://www.youtube.com/watch?v=BvdFjVjla7A