[Pocus]

I would like to specify that (for me at least):

tac engine upgrade: including more scripting options but also new rules of engagements, eg: skirmishers, perhaps the effect of formation or momentum of cavalry, etc.

new functionnality is rather close to new rules. i.e adding an ally screen mean you want some diplomacy, so its new major rules.

in user interface some more examples: how to find a specific item or a class of item in your empire (I think everybody is searching for his dwarven hammers each turn!), a summary of items worn by leaders, monthly forging, how to pool intelligently slaves (not on the ones doing sacrifice, etc.)...