I can answer some of these from the preview event;

Quote Originally Posted by antiwup
one thing i noticed about rome total war was its lack of battlefields to fight on in custom battle mode. in med2 will there be many fields to chose from like in the original medieval and will there be a custom map mode too?
Yes, there will be more battlefields and yes there will be an (unsupported) battlemap editor

one thing i would have liked to have seen is a fortification mode where during a battle you can dig in or create improvised defenses like stakes or small wooden ramparts or trenches.
Not sure, but the english longbowmen might be able to put stakes in front of them (at least in the historical battle they were there)

another thing i would like to see added is a video cut scene for naval battles

i think ambushes should be better like you can ambush an army in a camp or hit them while they march in column down a road.
No idea about these

i would also like to see a mode where you can sit an army in a town after it lost men in battle and fill its ranks over turns but lose skill points. a regiment lost 120 men than moves into a town sits for a turn or two and recruits 120 replacements but loses some skills dropping it down in experiance.
This was already in Rome; if you retrained a unit, the experience (and armor if the original unit had some upgraded things not available in the settlement where you retrained) got dilluted.
So it's a safe bet to say that's in like in Rome.


one more thing cannon on top of elephants is stupid and should not be used heavily hek it shouldn't be in the game! next thing you now there will be unicorns and ogres if there are cannon on elephants that should be kept to a rare minimum.
I actually did ask about it and they said they wouldn't have put it in unless there were at least some referances to them in history.


Will the AI support you in a war if you are allied? If so, will AI factions take into account your alliances before attacking you?

Also if you break an alliance/an AI faction breaks theirs will everyone trust them less?
The diplomatic AI will be taking into account more things, although I'm not sure if it takes these into account. It will look at economic and military strength, your relationship with them, and some others.
I'm heavily speculation here, but it might be nice and possible that if you are allied, part of those variables are added up (ie military strength is your own strength + some factor * allies strength). I have absolutely no idea if this is true, but it would be nice and at least seems like a reasonable idea.