Catching up a little, last month's dev diary gives a glimpse into both diplomacy and combat:
http://muhagames.com/master-of-magic-dev-diary-7-january-2022/It sounds as if fundamentally, there won't be a huge amount of structural change in how diplomacy works as compared to the original MOM. However, Muha appears to be banking on their AI -- including the six "personality" types from the original game -- making it a more involved & immersive experience.
In addition, they're expanding trade options to include mana, gold, and artifacts (whereas you could only trade spells before). If the AI has "need" of something in your inventory, it may initiate a trade offer, including bidding a bit more for said item than it might otherwise be worth.
This month's dev diary looks at another meaty subject -- the aforementioned magic in Master of Magic (specifically, spells):
http://muhagames.com/master-of-magic-dev-diary-8-february-2022/The devs talk a bit about how the spells are organized, and take a more specific look at two of the "realms" of magic -- Sorcery and Life. Spells from both realms are extremely useful and/or powerful, though obviously in different ways. Can't wait to see them in action!
Finally, a bunch of screenshots for your viewing pleasure (I really am digging the art design and overall aesthetic they've come up with):